Computer acronyms and abbreviations

Updated: 05/02/2021 by Computer Hope
Abbreviation definition, Acronym definition, Chat slang, File extensions, Shorthand, Slang

#! (Crunchbang Linux)
2-D (two-dimensional)
2FA (two-factor authentication)
2G (second generation)
3-D (three-dimensional)
3G (3rd Generation)
3GPP (3rd Generation Partnership Project)
5G (5th Generation)
24x7 (24 hours a day, seven days a week)
24/7 (24 hours a day, seven days a week)


AA (Anti-alias)
AAC (Advanced Audio Coding)
AAM (autmoatic acoustic management)
AAS (as a service or Auto Area Segmentation)
ABC (Atanasoff-Berry Computer)
Abend (abnormabl end)
ABIOS (Advanced BIOS)
ABP (AdBlock Plus)
AC (alternating current, anonymous coward, or Asheron's Call)
ACCT (account)
ACE (access control entry)
Ack (acknowledgment)
ACL (access control list)
ACM (Association for Computing Machinery)
ACPI (Advanced Configuration and Power Interface)
ACR (absolute cell reference, attenuation crosstalk ratio, actual cell rate, or annual compliance report)
ACS (access control system)
AD (Active Directory)
ADB (Android Debug Bridge or Apple Desktop Bus)
ADC (analog-to-digital)
ADO (ActiveX Data Object)
ADPCM (adaptive delta pulse code modulation)
ADSI (Active Directory Service Interface or analog display service interface)
ADSL (asymmetric digital subscriber line)
ADSM (ADSTAR Distributed Storage Management)
AE (After Effects or automatic exposure)
AE lock (auto exposure lock)
AES (Advanced Encryption Standard)
AF (Autofocus)
AGP (accelerated graphics port)
AHCI (Advanced Host Controller Interface)
AI (artificial intelligence)
AIM (AOL Instant Messenger or Apple, IBM, and Motorola)
AIML (Artificial Intelligent Markup Language)
AIMM (AGP in-line memory module)
AIO (All-in-One)
AIX (advanced interactive executive)
AJAX (Asynchronous JavaScript and XML)
AKA (also known as)
ALGOL (algorithmic language)
Alpha (alphabet)
ALU (arithmetic logic unit)
AM (amplitude modulation or ante meridiem)
AMA (ask me anything)
AMOLED (active-matrix organic light-emitting diode)
Amp (ampere)
ANI (Automatic Number Identification)
ANSI (American National Standards Institute)
AOP (aspect-oriented programming or auto operator)
AOSP (Android Open Source Project)
API (application programming interface)
APIC (Advanced Programmable Interrupt Controller)
APIPA (Automatic Private Internet Protocol Addressing)
APK (Android package file)
APM (advanced power management)
App (application)
APT (advanced packaging tool or advanced persistent threat)
APU (accelerated processing unit or advanced processing unit)
AR (augmented reality)
ARCnet (Attached Resource Computer network)
A record (address record)
Arg (argument)
ARP (Address Resolution Protocol)
ARPA (Advanced Research Projects Agency or address and routing parameter area)
ARPANET (Advanced Research Projects Agency Network)
ARQ (automatic repeat request)
AS (autonomous system)
AS/400 (Application System/400)
ASAP (as soon as possible)
ASCII (American Standard Code for Information Interchange)
ASME (American Society of Mechanical Engineers)
ASMR (autonomous sensory meridian response)
ASN (autonomous system number)
ASN.1 (abstract syntax number one)
ASP (Active Server Pages, application service provider, authorized service provider, or answer set programming)
ASPI (advanced SCSI programming interface)
ASR (automated system recovery or automatic speech recognition)
AT (advanced technology)
ATA (Advanced Technology Attachment)
ATAPI (AT Attachment Packet Interface)
ATC (advanced transfer cache)
ATF (above the fold)
ATM (ascynchronous transfer mode, at the moment, or automated teller machine)
ATRAC (Adaptive Transform Acoustic Coding)
ATX (Advanced Technology eXtended)
AU (arithmetic unit)
AUI (Attachment Unit Interface)
AUP (acceptable use policy)
Auto (automatic, automobile, or autonomous)
AV (antivirus, aperture value, or avatar)
AVC (Advanced Video Coding)
AVI (Audio Video Interleaved)
AVR (automatic voltage regulator, automatic voice recognition, or automatic voice response)
AWS (Amazon Web Services)


B2B (business-to-business)
B2B (business-to-consumer)
BAE (before anyone else)
Basic (Beginners All-purpose Symbolic Instruction Code)
BAT (Baby AT)
BB (broadband)
BBS (BIOS boot specification, bulletin board system, or be back shortly)
BC (before Christ)
BCC (blind carbon copy)
BCD (binary-coded decimal)
BCP (best current practices)
BCPL (Basic Combined Programming Language)
BD (Blu-ray disc)
BDC (backup domain controller)
BDF (Glyph Bitmap Distribution Format)
BDI (bidirectional isolation)
BDO (bidirectional override)
BER (bit error rate or beyond economical repair)
BERT (bit error rate tester or bit error rate test)
BF (Battlefield or boy friend)
BG (background, bad game, battleground or big grin)
BGA (ball grid array)
BGMP (Border Gateway Multicast Protocol)
BGP (Border Gateway Protocol)
BHO (Browser Helper Object)
Bi-di (bidirectional)
BIND (Berkeley Internet Name Domain)
BIO (biography)
BIOS (basic input/output system)
BISYNC (BinarySynchronous Communications)
Bit (binary digit)
BITNET (because it's time network)
BIU (bold, italic, underline)
BNC (Bayonet Neill-Concelman)
BO (back orifice)
BOFH (Bastard Operator From Hell)
BOINC (Berkeley Open Infrastructure for Network Computing)
BOM (byte order mark, bill of materials, beginning of message, or beginning of medium)
Bool (Boolean)
BPB (BIOS pattern block)
BPDU (Bridge Protocol Data Unit)
BPL (broadband-over-powerline)
bps (bits per second)
Bps (bytes per second)
BPSK (biphase shift keying)
Br (Break key)
BRI (basic rate interface)
Brouter (bridge router)
BSB (back-side bus)
BSC (Binary Synchronous Communications)
BSoD (Blue Screen of Death)
BSoD (Black Screen of Death)
BSS (basic service set)
BTC (bitcoin or Behavior Tech Computers)
BTDT (been there done that)
BTX (Balanced Technology eXtended)


C (Celsius)
C2 (Core 2)
CA (certificate authority)
Cab (Cabinet file)
CAD (computer-aided design)
CAP (Competitive Access Provider)
CAPS (CapsLock)
CAPSLK (CapsLock)
CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart)
CAS (column address select or column access strobe)
CASC (Certificate Authority Security Council)
CAT (Central Africa Time)
CATV (Cable TV or Community Access Television)
CBL (calculator based labs)
CBT (computer-based training)
CC (carbon copy, C compiler, Creative Commons, or Cursor control)
CCC (Catalyst Control Center)
CCD (charge-coupled device)
CCDE (Cisco Certified Design Expert)
CCFL (cold cathode fluorescent lighting)
CCIE (Cisco Certified Internetworking Expert)
CCITT (Comit Consultatif International Tlphonique et Tlgraphique)
CCNA (Cisco Certified Network Associate)
CCNP (Cisco Certified Network Professional)
CCS (call-control signaling or common command set)
CCTV (closed circuit television)
CCW (counterclockwise)
CD (change directory or compact disc)
CDA (Communication Decency Act or compact audio disc)
CDDA (compact disc digital audio)
CDDB (compact disc database)
CDDI (Copper Distributed Data Interface)
CDE (Common Desktop Environment)
CDfs (Compact Disc file system)
CD-i (Compact Disc Interactive)
CDMA (Code Division Multiple Access)
CDN (content delivery network or content distribution network)
CDP (Cache Discovery Protocol, Certificate in Data Processing, Columbia Data Products, content delivery platform, content discovery platform, or continuous data protection)
CD-PROM (Compact Disc-Programmable ROM)
CD-R (Compact Disc Recordable)
CDRFS (CD-R file system)
CD-ROM (Compact Disc Read-Only Memory)
CD-ROM XA (CD-ROM extended architecture)
CD-RW (Compact Disc Re-Writable)
CDSL (Consumer DSL)
CD-WO (Compact Disc Write Once)
CE (collector's edition, cancel entry, compact edition, or consumer edition)
Cell phone (cellular telephone)
CentOS (Community Enterprise Operating System)
CEO (chief executive officer)
CERN (Conseil Europeen pour la Recherche Nuclaire)
CERT (Computer Emergency Response Team, or certified)
Cert (certificate, certified, or certification)
CES (Consumer Electronics Show)
CF (CompactFlash)
CFPM (cubic feet per minute)
CGA (Color Graphics Adapter)
CGI (common gateway interface or computer-generated imagery)
CH (Computer Hope or College Humor)
CHAP (Challenge-Handshake Authentication Protocol)
Char (character)
chdir (change directory)
CHS (cylinder-head-sector)
cHTML (compact HTML)
CIDR (classless inter-domain routing)
CIFS (common Internet file system)
CIM (common information model)
CIR (committed information rate)
CISC (complex instruction set computer)
CISSP (certified information systems security professional)
CLCC (ceramic leadless lead carrier)
CLI (command-line interface)
CLNS (connectionless network service)
CLOS (Common Lisp object system)
CLR (common language runtime)
CLSID (class ID)
CLUT (color lookup table)
CMA (Computer Misuse Act)
CMC (computer-mediated communication)
CMOS (complementary metal-oxide semiconductor)
CMS (content management system)
CMYK (cyan magenta yellow black)
CNCT (Certified Network Computer Technician)
CNE (Certified Novell Engineer)
CNR (Communication and Network Riser)
CNST (Certified Network Systems Technician)
CO (central office)
COA (Certificate of Authenticity)
COAST (Cache On A STick)
COB (close of business, chip on board)
COBOL (Common Business Oriented Language)
Code (source code)
Codec (COmpression / DECompression)
Coil (electromagnetic coil)
COLA (comp.os.linux.announce)
COM (Component Object Model or Computer Output Microfilm)
COMDEX (Computer Dealers' Exhibition)
CompTIA (Computer Technology Industry Association)
Con (console, confidence, or conference)
COPPA (Children's Online Privacy Protection Act or California Online Privacy Protection Act)
Core (core dump)
CPA (cost per action or cost per acquisition)
CPAN (comprehensive Perl archive network)
CPC (cost per click)
CPGA (ceramic pin grid array)
CPI (characters per inch)
CPL (Combined Programming Language)
CPM (cost per thousand or cost per mile)
CPS (characters per second)
CPTM (cost per targeted thousand)
CPU (central processing unit)
CR (carriage return)
CRC (cyclic redundancy check)
CREN (Corporation for Research and Educational Networking)
C-RIMM (continuity RIMM)
CRL (Certificate Revocation List)
CR/LF (carriage return/line feed)
CRM (customer relationship management)
CRT (cathode ray tube)
Crypto (cryptography)
CS (customer service, computer science, counter-strike, cable select, or code segment)
CSMA/CD (carrier sense multiple access/collision detection)
CSNET (Computer Science Network)
CSS (cascading style sheets, Content Scramble System, chirp spread spectrum)
CST (Computer Service Technician)
CSU/DSU (Channel Service Unit/Data Service Unit)
CSV (comma-separated values)
CTA (call to action)
CTCP (client-to-client protocol)
CTD (crash to desktop)
CTF (Capture the Flag)
CTO (technology officer or chief technical officer)
CTR (click-through rate)
Ctrl (Control key)
CTS (Clear to Send)
CTTY (change teletype)
CU (control unit)
CUI (character user interface or command-line user interface)
CUPS (Common Unix Printing System)
Curmbox (Current Mailbox)
CUT (Coordinated Universal Time)
CVE (Common Vulnerabilities and Exposures)
CVS (Concurrent Version System)
CWIS (Campus Wide Information System)


D (depth)
D2D (disk-to-disk)
DAC (digital-to-analog converter or discretionary access control)
DACL (discretionary access control list)
DAE (digital audio extraction, does anyone else)
DARPA (Defense Advanced Research Projects Agency)
DART (Data Access in Real Time, Dynamic Analysis and Replanning Tool, or Microsoft Diagnostics and Recovery Toolset
DASD (direct access storage device)
DASP (Disk Anti-Shock Protection, Drive Active Slave Present, or Dynamic Adaptive Speculative Pre-Processor)
DAT (Digital Audio Tape)
DAW (digital audio workstation)
DB (database)
DBA (database administrator, database analyst, decibels adjust, or doing business as)
DBAN (Darik's Boot and Nuke)
DBMS (database management system)
DC (direct current, domain controller, data center, or disconnect)
DCC (Direct Client-to-Client)
DCE (data circuit-terminating equipment, data communication equipment, Desktop Composting Engine, or distributed computing environment)
DCIM (digital camera images)
DCOM (Distributed Component Object Model)
DD (double density or don't die)
DDBMS (distributed database management system)
DDE (Dynamic Data Exchange)
DDK (driver development kit)
DDL (data definition language)
DDNS (dynamic DNS)
DDO (disk drive overlay or Dungeons & Dragons Online)
DDoS (Distributed Denial of Service)
DDP (Datagram Delivery Protocol)
DDR (double data rate, dial-on-demand routing, or Dance Dance Revolution)
DDR2 (double data rate two)
DDR3 (double data rate three)
DDR4 (double data rate four)
DDR SDRAM (double data rate synchronous dynamic random access memory)
DDS (Digital Data Storage)
DEA (Data Encryption Algorithm)
DEC (Digital Equipment Corporation)
DES (Data Encryption Standard)
DFMC (direct methanol fuel cell)
DHCP (Dynamic Host Configuration Protocol)
DHTML (dynamic Hypertext Markup Language)
DID (direct inward dialing)
DIF (Directory Interchange Format)
DIME (direct Internet message encapsulation)
DIMM (dual in-line memory module)
DIP (dual in-line package)
DIVX (digital video express)
DIX (Digitial, Intel, and Xerox)
DL (download or down low)
D/L (download)
DLA (drive letter access)
DLC (Data Link Control, digital loop carrier, or downloadable content)
DLL (dynamic-link library)
DLNA (Digital Living Network Alliance)
DLP (data loss prevention, data level parallelism, discrete logarithm problem, or Digital Light Processing)
DLT (digital linear tape)
DM (direct message, Device Manager, or deathmatch)
DMA (direct memory access)
DMAC (Direct Memory Access Control)
DMAR (destination memory address register)
DMCA (Digital Millennium Copyright Act)
DMI (Desktop Management Interface)
DML (data manipulation language)
DMTF (Distributed Management Task Force)
DMZ (demilitarized zone)
DNS (Domain Name System)
DOA (dead on arrival)
DoCoMo (Do Communications Over Mobile)
DOD (Department of Defense)
DoS (denial of service)
DOS (disk operating system)
DoT (damage over time)
Double (Double-precision floating-point)
DP (DisplayPort)
DPI (dots per inch)
Dpkg (Debian package manager)
DPMI (DOS Protected Mode Interface)
DPMS (display power management system)
DPS (damage per second)
DRAM (dynamic random access memory)
DRM (digital rights management)
Drop (malware dropper)
DRQ (data request)
DS (drive select)
DSAP (Destination Service Access Point)
DSL (digital subscriber line or Damn Small Linux)
DSO (data source object)
DSP (digital signal processor or drive secondary present)
DSR (Dynamic Source Routing or Dell System Restore)
DSS (Digital Satellite Service or Digital Signature Standard)
DSVD (Digital Simultaneous Voice and Data)
DTE (data terminal equipment or data terminating equipment)
DTR (Data Terminal Ready)
DTS (digital thermal sensor, Digital Theater Sound, or data transformation services)
DTX (discontinuous transmission)
DUN (Dial-Up Networking)
DUST (did you see that)
DUT (device under test)
DVD (digital versatile disc)
DVI (digital visual interface)
DVMT (Dynamic Video Memory Technology)
DVR (Digital Video Recorder)
Dword (double word)
DxDiag (DirectX diagnostics)


E (Enlightenment)
E-911 (Enhanced 911)
E3 (Electronic Entertainment Expo)
EA (Electronic Arts)
EAI (enterprise application integration)
EAP (Extensible Authentication Protocol)
EAP-FAST (Flexible Authentication via Secure Tunneling)
EAPROM (Electronically Alterable Programmable Read-Only Memory)
Eb / EB (Exabit / Exabyte)
EBCDIC (Extended Binary Coded Decimal Interchange Code)
E-book (electronic book)
ECC (error-correcting code)
ECDSA (Elliptic Curve Digital Signature Algorithm)
ECHS (extended cylinder-head-sector)
ECMA (European Computer Manufacturers Association)
ECP (Extended Capabilities Port)
EDA (electronic design automation)
EDI (electronic data interchange)
EDIINT (electronic data interchange-Internet integration)
EDO (Extended Data Out)
EDP (electronic data processing)
EDSAC (Electronic Delay Storage Automatic Calculator)
EDVAC (Electronic Discrete Variable Automatic Computer)
EEPROM (electrically erasable programmable read-only memory)
EFI (Extensible Firmware Interface)
EFS (Encrypting File System)
EGA (Enhanced Graphics Adapter)
eGPU (external graphics processing unit)
EHCI (enhanced host controller interface)
EIA (Electronic Industries Alliance)
EIDE (enhanced integrated drive electronics)
EIGRP (Enhanced Interior Gateway Routing Protocol)
EISA (Extended Industry Standard Architecture or Extended ISA)
EIST (enhanced Intel SpeedStep technology)
ELD (electroluminescent display)
E-learning (electronic learning)
ELF (extremely low frequency)
EM (emphasized)
E-mail (electronic mail)
EMF (electromotive force or enhanced metafile)
EMI (electromagnetic interference)
EMM (expanded-memory manager)
EMS (emergency management services or expanded memory specification)
ENIAC (Electronic Numerical Integrator and Calculator)
EOD (end of day or end of discussion)
EOF (end-of-file)
EOL (end of life or End-of-Line)
EOM (end-of-message)
EOP (end-of-page)
EOT (End-of-Transmission or end of topic)
EOW (end of week)
EPD (electronic paper display)
EPIC (Electronic Privacy Information Center)
EPP (Enhanced Parallel Port)
EPROM (Erasable Programmable Read-Only Memory)
EPS (encapsulated PostScript)
ePUB (electronic publication)
EQ (equals, equalizer, or EverQuest)
ESA (Entertainment Software Association)
ESCD (Extended System Configuration Data)
ESD (electrostatic discharge)
ESDI (Enhanced Small Disk Interface)
ESI (Enhanced Serial Interface)
ESP (e-mail server provider)
ESRB (Entertainment Software Rating Board)
ETA (estimated time of arrival)
ETA-I (Electronic Technicians Association International)
ETX (End-of-Text)
EULA (End-User License Agreement)
Eval (evaluate)
EVD (enhanced versatile disc)
EV-DO (Evolution-Data Optimized or Evolution-Data Only)
EVP (enhanced virus protection)
exFAT (Extended File Allocation Table)


F (fahrenheit)
FAD (functioning as designed)
Famicom (family computer)
FAQ (frequently asked questions)
FAST (Flexible Authentication via Secure Tunneling)
FAT (file allocation table)
FAU (file allocation unit)
Fav (favorite)
FB (facebook or frame buffer)
FCC (Federal Communications Commission)
FCIP (Fibre Channel over IP)
FC-PGA (flip-chip pin grid array)
FD (floppy drive or file descriptor)
FDC (Floppy Disk Controller)
FDD (floppy disk drive)
FDDI (Fiber Distributed Data Interface)
FDHP (Full Duplex Handshaking Protocol)
Feat (feature)
FF (Firefox, fast forward, form feed, or friends forever)
FFA (free for all)
FFS (For F***'s Sake, freefall sensor)
FHD (Full High Definition)
FIF (fractal image format)
FIFO (first in, first out)
FiOS (Fiber Optic Service)
FIPS (Federal Information Processing Standards)
Fixed (fixed-point)
FLAC (Free Lossless Audio Codec)
Flash (Adobe Flash)
Float (floating-point)
FLOPS (Floating-Point Operation Per Second)
FM (frequency modulation)
FMV (full motion video)
Fn (function)
FNBN (for nerds by nerds)
FNEA (full name and e-mail address)
FNR (format and restore)
FOAD (fu** off and die)
FOIA (Freedom of Information Act)
FOIRL (fiber-optic inter-repeater links)
FOMO (fear of missing out)
FORTRAN (Formula Translation)
FOSS (free and open-source software)
FP (fast page or FrontPage)
FPGA (field-programmable gate array)
FPM (fast page mode)
FPROM (field programmable read-only memory)
FPS (frames per second or first-person shooter)
FPU (floating-point unit)
FQDN (fully qualified domain name)
FR (Frame Relay)
FRAM (Ferroelectric RAM)
FRU (field-replacable unit)
FS (file system)
FSB (front-side bus)
Fsck (file system check)
FSM (female seeking male)
FSO (free-space optical communication)
FSP (File Sharing Protocol)
Fstab (file systems table)
FSTN (film supertwist nematic)
Fstype (file system type)
FTAM (file transfer, access and management)
FTC (Federal Trade Commission)
FTP (File Transfer Protocol)
FU (fu** you)
FUBAR (f***ed up beyond all repair, fouled up beyond all recognition, or fouled up beyond all repair)
FUD (fear, uncertainty, and doubt)
FWH (Firmware Hub)
FYI (for your information)


G+ (Google Plus)
G2G (Good to go, Got to go, or government to government)
GA (general availabililty)
GaAs (Gallium Arsenide)
Gb / GB (gigabit / gigabyte)
GBIC (gigabit interface converter)
Gbps (Gigabits per second)
GCC (GNU Compiler Collection)
GCHQ (Government Communications Headquarters)
GCR (group code recording)
GDDR (graphics double data rate)
GDI (Graphics Device Interface)
GDPR (General Data Protection Regulation)
GE (General Electric or "greater than or equal to")
GEM (Graphics Environment Manager)
GF (GeForce)
GFM (GitHub Flavored Markdown)
GFS (Global File System or Google File System)
GHz (Gigahertz)
Gib / GiB (gibibit / gibibyte)
GIGO ("garbage in, garbage out")
GIMP (GNU image manipulation program)
GIMPS (great Internet mersenne prime search)
GIS (Geographic Information System)
GIYF (Google Is Your Friend)
GKS (Graphical Kernel System)
GM (game masters, gold master, golden masters, good morning, or good manners)
Gmail (Google Mail)
GNU (GNU's Not Unix)
Goat (greatest of all time)
GPF (general protection fault)
GPG (GNU Privacy Guard)
GPL (general public license)
GPO (Group Policy Object)
GPPM (graphic pages per minute)
GPRS (General Packet Radio Service)
GPS (Global Positioning System)
GPT (GUID partition table)
GPU (graphics processing unit)
Gram (Instagram)
Gravatar (globally recognized avatar)
GRUB (GRand Unified Bootloader)
GSM (Global System for Mobile communication)
GT (Greater than or Greenwich Mean Time)
GTA (Grand Theft Auto)
GTK (GIMP toolkit)
GUI (graphical user interface)
GUID (globally unique identifier)
GWAM (gross words a minute)
Gzip (GNU zip)


H (height)
HACMP (high availability cluster multiprocessing)
HAL (hardware abstraction layer)
HAN (home area network)
HBA (host bus adapter)
HCI (human computer interface)
HCL (hardware compatibility list)
HD (hard drive, high-definition, or high-density)
HDC (hard disk controller)
HDCP (High-bandwidth Digital Content Protection)
HDD (hard disk drive)
HD DVD (High Definition Digital Versatile Disc)
HDLC (High-level Data Link Control)
HDMI (High-Definition Multimedia Interface)
HDML (handheld device markup language)
HD-ROM (high-density read-only memory)
HDSL (high-bit-rate digital subscriber line)
HDTV (high-definition TV)
HEIF (High Efficiency Image File format)
HES (hypertext editing system)
HEVC (high efficiency video coding)
HFC (hybrid fiber coax)
HFS (hierarchical file system)
HGA (Hercules graphics adapter)
HID (human interface device)
Hiew (hacker's view)
Hi-res (high resolution)
HIT (human intelligence task)
HLL (high-level language)
HMA (high-memory area)
HMU (hit me up)
HOP (half OP)
HOPE (hackers on planet Earth)
HoT (Heal over Time)
HP (Hewlett-Packard or Hit Points)
HPA (high-performance addressing or hidden protected area)
HPD (hybrid passive display)
HPFS (high-performance file system)
HPGL (Hewlett Packard Graphic Language)
HP-UX (Hewlett Packard UniX)
HQ (high-quality)
HR (Human Resources)
HREF (Hypertext reference)
HSB (Hue, Saturation, and Brightness)
HSF (heat sink and fan)
HSL (Hue, Saturation, and Lightness)
HSSI (High-Speed Serial Interface)
HSYNC (Horizontal Synchronization)
HT (Hyper-Threading or HyperTransport)
HTML (Hypertext Markup Language)
HTML <tr> tag
HTPC (home theater personal computer)
HTTP (Hypertext Transfer Protocol)
HUD (heads up display)
Huh (Have you heard)
HW (hardware)
Hz (Hertz)


IA-32 (Intel Architecture 32)
IA-64 (Intel Architecture 64)
IAB (Internet Architecture Board)
IAC (In Any Case or Interapplication communications)
IAD (integrated access device)
IANA (Internet Assigned Numbers Authority)
IAP (Internet access provider)
IBG (interblock gap)
ICA (independent computing architecture, or integrated communications adapter)
Icacl (Integrity control access control list)
ICANN (Internet Corporation for Assigned Names and Numbers)
ICCCM (Inter-Client Communication Conventions Manual)
ICCP (Institute for Certification of Computer Professionals)
ICMP (Internet Control Message Protocol)
ICO (icon or Initial Coin Offering)
iCOMP (Intel comparative microprocessor performance)
ICRA (Internet Content Rating Association)
ICS (Internet Connection Sharing)
ICT (information and communications technology or International Computers and Tabulators)
ICU (instruction cache unit, interface converter unit, ISA configuration utility, or interactive chart utility)
IDC (insulation displacement contact or insulation displacement connector)
IDE (integrated development environment or integrated device electronics)
IDEA (International Data Encryption Algorithm)
IDMS (Integrated Database Management System)
IDPS (intrusion detection prevention system)
IDS (intrusion detection system)
IDSL (integrated services digital network digital subscriber line)
IE (Internet Explorer)
IEC (International Electrotechnical Commision)
IEEE (Institute of Electrical and Electronics Engineers)
IEN (Internet Experiment Note, Internet Engineering Notes, or Image-Enabled Netware)
IETF (Internet engineering task force)
IF (interactive fiction)
IFIP (International Federation for Information Processing)
IFTF (Interactive Fiction Technology Foundation)
IGES (Initial Graphics Exchange Specification)
IGMP (Internet Group Management Protocol)
IGP (Interior Gateway Protocol)
IHA (Intel Hub Architecture)
IIL (integrated injection logic)
IIS (Internet Information Server)
IM (instant message, instant messenger, or instant messaging)
IMAP (Internet Message Access Protocol)
IMDb (Internet Movie Database)
IMEI (International Mobile Equipment Identity)
IMSI (International Mobile Subscriber Identity)
INC (incorporated, or incoming)
INCITS (International Committee for Information Technology Standards)
Inetd (Internet service daemon)
Info (information)
Inode (index node)
Int (integer)
INTA (INTernational Trademark Association or INTerrupt Acknowledge)
INTR (interrupt)
I/O (input/output)
IOC (input/output controller)
IOCCC (Internet Obfuscated C Code Contest)
IOPS (input/output operations per second)
IOS (Input/Output Supervisor or Internetworking operating system)
IP (Internet Protocol, ingress protection, intellectual property)
IPB (illustrated parts breakdown)
IPC (interprocess communication, instructions per cycle)
IPD (interpupillary distance)
IPF (invalid page fault)
IPL (initial program load)
IPng (Internet Protocol next generation)
IP Rating (Ingress Protection Rating)
IPS (intrusion prevention system)
IPsec (Internet Protocol security)
IPTO (Information Processing Technology Office)
IPTV (Internet Protocol television)
IPv4 (Internet Protocol version 4)
IPv6 (Internet Protocol version 6)
IPX/SPX (Internetwork Packet Exchange/Sequenced Packet Exchange)
IR (infrared, or information retrieval)
IRC (Internet Relay Chat)
IrDA (Infrared Data Association)
IRG (interrecord gap)
IRGB (Intensity-Red-Green-Blue)
IRL (in real-life)
IRQ (interrupt request)
IS (image stabilization, Information Services, or Information Systems)
ISA (Industry Standard Architecture)
ISACA (Information System Audit and Control Association)
ISAM (indexed sequential access method)
ISAPI (Internet Server Application Programming Interface)
ISATAP (Intra-Site Automatic Tunnel Addressing Protocol)
ISBN (International Standard Book Number)
ISDN (Integrated Services Digital Network)
ISIS (Image and Scanner Interface Specification, infinitely scalable intelligent storage, or integrated software for imagers and spectrometers)
ISO (International Organization for Standardization)
ISP (Internet service provider)
ISV (independent software vendor)
IT (information technology)
ITC (International Typeface Corporation)
ITIL (Information Technology Infrastructure Library)
ITU (International Telecommunication Union)
ITX (Information Technology eXtended)


JAR (Java archive)
Java EE (Java Platform, Enterprise Edition)
JCL (job control language)
JDBC (Java Database Connectivity)
JDK (Java Development Kit)
JEDEC (Joint Electron Device Engineering Council)
JHTML (Java within HTML)
JIL (Java Intermediate Language or Joint Innovation Lab)
JIT (just-in-time)
JNI (Java Native Interface)
JPEG (Joint Photographic Experts Group)
JRE (Java Runtime Environment)
JSON (JavaScript Object Notation)
JSP (JavaServer Pages)
JSR (jump to subroutine)
JTAG (Joint Test Action Group)
JVM (Java virtual machine)


K (kilobit, OK)
kb / kbit (kilobit)
KB (knowledge base)
Kbps (kilobits per second)
KDE (K Desktop Environment)
kHz (kilohertz)
KiB (kibibyte)
Kib (kibibit)
kilo (one thousand)
KOS (kill on sight)
KVM (keyboard, video, and mouse or Kernel-based Virtual Machine)


L2 (level 2 cache)
L2P (learn to play)
L2TP (Layer 2 Tunneling Protocol)
LAME (LAME ain't an MP3 encoder)
LAN (local area network)
LAPM (Link Access Procedure for Modems)
Laser (light amplification by stimulated emission of radiation)
LAWN (local area wireless network)
LBA (large block addressing)
LBS (location-based service)
LC (lowercase)
LCC (leadless chip carrier)
LCD (liquid crystal display)
LD (laserdisc)
LDAP (Lightweight Directory Access Protocol)
LE (Less than or Equal to)
LED (light-emitting diode)
LED monitor (light-emitting diode)
LF (line feed)
LFAP (Light-weight Flow Admission Protocol)
LFD (Login Failure Daemon)
LFG (looking for group)
LFM (looking for more)
LFN (long file name)
LG (Life's Good)
LGA (land grid array)
LGPL (Lesser General Public License)
LH (Loadhigh)
LIFO (last in, first out)
Li-ion (lithium-ion)
LILO (Last In Last Out or Linux loader)
Li-polymer (lithium-polymer)
LIPS (Linear Inferences Per Second or LInux Phone Standard)
Lisp (List Processing)
LISTSERV (list server)
LKGC (last known good configuration)
LLC (limited liability company or Logical Link Control)
LMK (let me know)
LMS (Learning Management System)
LNP (local number portability)
LOD (level of detail)
LOF (loss of frame)
LOL (laugh out loud, League of Legends, lots of love, or lots of luck)
Lo-res / low-res (low-resolution)
LOS (Line of Sight or Loss of signal)
LP (long play)
LPB (low ping b*^$#)
LPD (line printer daemon)
LPI (lines per inch)
LPM (lines per minute)
LPS (Library Programs Service)
LPT (line printer terminal)
LPWAN (low-power wide-area network)
LPX (Low Profile eXtension)
LQ (letter-quality)
LRC (longitudinal redundancy check)
LRDIMM (load-reduced dual inline memory module)
LRU (line replaceable unit or least recently used)
LSB (least significant bit)
LSC (least significant character)
LSD (least significant digit)
LSP (Layered Service Provider or link state packet)
LTE (Long-Term Evolution)
LU (logic unit or logical unit)
Luser (Local user)
lvl (level)
LZ or Lzone (Landing Zone)


m (milli)
M- (meta key)
MAC (media access control or Macintosh)
Macro (macroinstruction)
MAE (Metropolitan Area Ethernet)
mAH (milliamp hour)
MAN (manual or metropolitan area network)
MAPI (Message Application Programming Interface)
MAPS (Mail Abuse Prevention Systems)
MAR (memory address register)
Matlab (matrix laboratory)
Matrix (Matrix code)
MAU (media access unit)
Max (maximize or maximum)
mb (motherboard)
Mb (megabit)
MB (megabyte)
MBAM (Malwarebytes)
MBean (Managed Beans)
MBL (microcomputer-based labs)
Mbps (megabits per second)
MBps (megabytes per second)

MBR (master boot record)
MC (megacycle)
MCA (Micro Channel Architecture)
MCGA (memory controller gate array or multicolor graphics array)
MCITP (Microsoft Certified IT Professional)
MCSA (Microsoft Certified Systems Administrator)
MCSE (Microsoft Certified System Engineer)
MDA (Monochrome Display Adapter)
MDBMS (Multidimensional Database Management System)
MDC (modification detection code)
MDF (main distribution frame)
MDI (multiple-document interface)
MDRAM (Multibank DRAM)
Memo (memorandum)
MFA (multi-factor authentication)
Mflop (megaflop)
MFM (Modified Frequency Modulation)
MFP (multifunction printer)
MFT (Master File Table)
Mget (multiple get)
MHz (megahertz)
Mib (mebibit)
MiB (mebibyte)
MIB (management information base)
MICR (magnetic ink character recognition)
Microsoft MVP (Microsoft Most Valuable Professional)
MIDI (Musical Instrument Digital Interface)
MIME (Multipurpose Internet Mail Extension)
MIMO (multiple-input, multiple-output)
Min (minimum)
MIN (mobile identification number)
MIPS (millions of instructions per second)
MIR (mail in rebate)
MIS (management information system)
MIT (Massachusetts Institute of Technology)
MITMA (man-in-the-middle attack)
Mkdir (make directory)
MMC (MultiMediaCard or Microsoft Management Console)
MMI (man machine interface)
MMORPG (massively multiplayer online role playing game)
MMS (Multimedia Message Service)
MMU (memory management unit)
MMX (MultiMedia eXtension)
MNP (Microcom Network Protocol)
Moblog (mobile blog)
Mod (modulo)
Model no. (model number)
Modem (modulator/demodulator)
MO diskette (magneto-optical diskette)
Mofo (Mozilla Foundation)
MOS (metal-oxide-semiconductor)
MOSFET (metal-oxide semiconductor field-effect transistor)
MOTD (message of the day)
MOV (Metal Oxide Varistor)
MPAA (Motion Picture Association of America)
MPC (Multimedia Personal Computer)
MPEG (Moving Picture Experts Group)
MPI (message passing interface)
MPLS (Multiprotocol Label Switching)
MPP (massively parallel processing)
Mput (multiple put)
MRP (Materials Requirement Planning)
MRU (Maximum Receive Unit)
MRUD (Most Recently Used Directory)
MS (millisecond, Microsoft, or memory stick)
MSC (Most Significant Character)
MSCS (Microsoft Cluster Server)
MSD (Microsoft Diagnostics or Most Significant Digit)
MSDN (Microsoft Developer Network)
MS-DOS (Microsoft Disk Operating System)
MSDS (material safety data sheet)
MSE (Microsoft Security Essentials)
MSF (male seeking female)
MSN (The Microsoft Network)
MSP (Management Service Provider)
MSRP (Manufacturer's Suggested Retail Price)
MSVC (Microsoft Visual C++)
MT (Moluccas or mistell)
MTA (mail transfer agent or message transfer agent)
MTBF (mean time between failure)
MTU (maximum transmission unit)
MUD (multi-user dungeon)
MUI (multi-user interface)
MUT (Mauritius Time or MultiUser Talk)
Mutex (mutual exclusion object)
MVNO (mobile virtual network operator)
MVP (most valuable player)
MVS (multiple virtual storage)
MX record (Mail eXchange record)


N (nano)
N/A (not applicable or not available)
NA (North American, not applicable, or not available)
NAK (negative acknowledgment)
NaN (not a number)
NAS (network access server or network-attached storage)
NAT (Network Address Translation)
NCP (NetWare Core Protocol or Network Control Protocol)
NCSA (National Center for Supercomputing Applications)
NCSC (National Cybersecurity Center)
NDA (non-disclosure agreement)
NDAS (Network Direct Attached Storage)
NDIS (network driver interface specification)
NDR (non-destructive readout, network data representation, or non-active, dormant, to be removed)
NDRO (non-destructive readout)
ne (not equal)
NEC (Nippon Electronics Company or National Electrical Code)
NEM (New Economic Movement)
Net (network)
NetBEUI (NetBIOS Enhanced User Interface)
NetBIOS (Network Basic Input/Output System)
NFC (near-field communication)
NFR (Not For Resell)
NFS (network file system)
NG (newsgroup)
NGL (not gonna lie)
NIC (network interface card)
NIDS (network intrusion detection system)
NII (National Information Infrastructure)
NiMH (nickel-metal hydride)
Nimrod (National Institute Machine Radiating On Downs)
NIP (non-impact printer)
NIT (Network Information Table or Network Interface Tap)
NLP (natural language processing)
NLQ (near letter-quality)
NLS (online system)
NLX (New Low Profile Extended)
nm (nanometer)
NMI (nonmaskable interrupt)
NMS (network management system)
NNTP (Network News Transfer Protocol)
NOBUS (Nobody But Us)
NO-OP (no operatation)
NOR (Not-Or)
NOS (network operating system)
NPAPI (Netscape Plugin Application Programming Interface)
NPC (non-playable character, non-printing character, or NP-Complete)
NRZ (non-return-to-zero)
ns (nanosecond, nice shot, or not sure)
NSAP (Network Service Access Point)
NSFNET (National Science Foundation Network)
NSP (Name Server Protocol, network service provider, or news service provider)
NSPA (Network Service Point Address)
NSSN (National Standards Systems Network)
NTFS (NTFS file system)
NTLDR (NT loader)
NTP (Network Time Protocol)
NTSC (National Television System Committee)
NTWY (noteworthy)
NUC (Next Unit of Computing)
Num (number)
NVRAM (non-volatile random-access memory)
NWAM (Network Auto Magic)


OA (office automation)
OBJ (object)
OC (optical carrier or overclock)
OCR (optical character recognition or optical character reader)
OCTAVE (operationally critical threat, asset, and vulnerability evaluation)
ODBC (Open Database Connectivity)
ODI (Open Data-Link Interface)
ODP (OverDrive Processor)
ODPR (OverDrive Processor Replacement)
OEM (original equipment manufacturer)
OHCI (Open Host Controller Inferface)
OID (object identifier)
OIN (Open Invention Network)
OLAP (online analytical processing)
OLE (Object Linking and Embedding or OnLine English)
OLED (organic light-emitting diode)
OLPC (one laptop per child)
OLTP (online transaction processing)
OMR (optical mark reading)
OO (object-oriented or OpenOffice)
OOF (out of office)
OOP (object-oriented programming)
OP (operation, operator, opinion, original poster, or overpowered)
Open (open source)
OpenAL (Open Audio Library)
OpenGL (Open Graphics Library)
OR (OR operator or operation research)
OS (operating system)
OSD (on-screen display, object-based storage device, or open source definition)
OSF (Open Software Foundation)
OSHA (Occupational Safety and Health Administration)
OSI (Open Systems Interconnection or Open-Source Initiative)
OSK (on-screen keyboard)
OSPF (open shortest path first)
OSRI (operating system reinstall)
OSS (open-source software or operations support systems)
OTP (on the phone, one-time password, or one-time programmable)
OVR (overtype mode)


PaaS (Platform as a Service)
PAD (packet assembler/disassembler)
PAE (Physical Address Extension)
PARC (Palo Alto Research Center)
Parm (parameter)
PATA (Parallel AT Attachment)
Pb (petabit)
PB (Packard Bell or petabyte)
PBX (private branch extension or private branch exchange)
PC (personal computer or player character)
PCB (printed circuit board)
PC-DOS (Personal Computer Disk operating system)
PCI (Peripheral Component Interconnect)
PCIe (PCI Express)
PCI-X (Peripheral Component Interconnect Extended)
PCL (printer command language)
PCM (pulse-code modulation)
PCMCIA (Personal Computer Memory Card International Association)
P-code (pseudocode or packed code)
PDA (personal digital assistant)
PDC (Primary Domain Controller)
PDF (Portable Document Format or Package Definition File)
PDL (page-description layer)
PDP (Programmed Data Processor)
PDU (protocol data unit)
PEAR (PHP Extension and Application Repository)
PEGI (Pan-European game information)
PEP (Packet Ensemble Protocol)
Permalink (permanent link)
PET (Personal Electronic Transactor)
PGA (pin grid array, Professional Graphics Adapter, or Professional Golf Association)
Pg Dn (page down)
PGP (Pretty Good Privacy)
Pg Up (page up)
PHP (PHP: Hypertext Preprocessor)
Pic (picture)
PICNIC (problem in chair not in computer)
PICO (PIne COmposer)
PICS (Platform for Internet Content Selection)
PID (process identifier or product identification)
PIF (program information file)
PII (Pentium 2 or personally identifiable information)
PIIX (PCI IDE Xcelerator)
PIM (personal information management or Protocol Independent Multicast)
PIN (personal identification number)
PIO (programmed input/output)
PL (power leveling)
PLCC (plastic leaded chip carrier)
PLED (Power LED)
Plus (Microsoft Plus!)
PM (private message, personal message, power management, Presentation Manager, preventive maintenance, post meridiem, or polarization maintaining)
P-machine (pseudomachine)
PMF (polarization maintaining fiber)
PMS (Pantone Matching System)
PN (part number)
PNG (Portable Network Graphics)
PnP (Plug and Play or party and play)
POD (plain old documentation or print on demand)
POE (point of entry or Power over Ethernet)
POP (Post Office Protocol or point of pressence)
PoS (Proof-of-Stake)
POS (packet over SONET, parent over shoulder, piece of s#!^, or point of sale)
POSIX (Portable operating system interface for Unix)
POST (power-on self-text)
POTS (plain old telephone system)
POV (point of view)
PoW (Proof-of-Work)
PPC (pay per click)
PPGA (Plastic Pin Grid Array)
PPI (pixels per inch)
PPM (pages per minute or Perl package manager)
PPP (Point-to-Point Protocol)
PPPoE (Point-to-Point Protocol over Ethernet)
PPS (Privacy Policy Statement)
PPT or PP (PowerPoint)
PPTP (Point-to-Point Tunnel Protocol)
PR (Pagerank or press release)
PRAM (Parameter RAM)
Printf (print formatted)
PRISM (Planning Tool for Resource Integration, Synchronization, and Management)
Privmsg (Private Message)
PRN (printer)
Proglog (progress log)
Prolog (Programming in Logic)
PROM (programmable read-only memory)
PrtScrn or Prt Scrn (Print Screen key)
PS (power supply, PowerShell, or print screen)
PS/2 (Personal System/2)
PS2 (PlayStation 2)
PS3 (PlayStation 3)
PS4 (PlayStation 4)
PSAT (Preliminary Scholastic Assessment Test)
PSD (Photoshop Document)
PSoC (programmable system on a chip)
PSP (PlayStation Portable, Python Server Pages, Paint Shop Pro)
PSR (Problem Steps Recorder)
PST (Pacific Standard Time, please send tell, Personal Store)
PSTN (public switched telephone network)
PSU (power supply unit)
PTR (Public Test Realm)
PTS (pseudoterminal slave)
PTY (pseudoterminal)
PU (physical unit)
PUBG (PlayerUnknown's Battlegrounds)
PUG (pickup group)
PVE (Player vs. Environment)
PVP (Player vs. Player)
PVR (personal video recorder)
PW (password)
PWA (progressive web application)
PWD (print working directory or password)
PWS (Personal Web Server)
Px (pixel)
PXE (preboot execution environment)
PXI (PCI extensions for instrumentation)


Q&A (questions and answers)
QA (quality assurance)
QAM (quadrature amplitude modulation)
QBE (query by example)
QHD (Quad High Definition)
QIC (quarter-inch cartridge)
QLED (quantum-dot light emitting diode)
QMAC (Quad Media Access Controller)
QnA (questions and answers)
QoS (quality of service)
QPSK (quadrature phase shift keying)
QR Code (Quick Response Code)
QSXGA (Quad Super Extended Graphics Array)


RAD (rapid application development)
RADIUS (Remote Authentication Dial-in User Service
RADSL (rate-adaptive DSL)
RAID (redundant array of independent disks)
RAM (random access memory)
RAMAC (random-access method of accounting and control)
RAP (Route Access Protocol)
RAR (Roshal Archive)
RARP (Reverse Address Resolution Protocol
RAS (remote access server, Remote Access Service, row address select, or row access strobe)
RAT (Remote Access Trojan)
RBAC (role-based access control)
RBL (real-time blackhole list)
RC (release candidate, remote connection, remote control, or run commands)
RCE (Remote Code Execution, Reverse Code Engineering, or Regional Coding Enhancement)
RCS (revision control system)
RDBMS (relational database management system)
RDF (Resource Description Framework)
RDMS (report distribution management system)
RDP (Remote Desktop Protocol)
RDRAM (Rambus Dynamic Random Access Memory)
Rec. (receive)
REC (Record)
ReFS (Resilient File System)
Regex (regular expression)
Rel (release)
REM (remark)
REPL (read-eval-print loop)
RF (radio frequency)
RFC (Request for Comments)
RFI (Radio Frequency Interference, request for information)
RFID (radio frequency identification)
RF shielding (radio frequency shielding)
RGB (red-green-blue)
RHCE (Red Hat Certified Engineer)
RIAA (Recording Industry Association of America
RIP (raster image processor, raster image process, or Routing Information Protocol)
RIPE notes (Reseaux IP Europeens notes)
RISC (reduced instruction set computer)
RJ-45 (Registered Jack-45)
RL (real-life)
RLE (run-length encoding)
RLL encoding (run-length limited encoding)
RLP (resource location protocol)
RMA (return materials authorization)
RMS (root mean square)
ROM (read-only memory)
ROM BIOS (read-only memory basic input/output system)
RO terminal (read-only terminal)
RPC (remote procedure call)
RPG (role playing game, report program generator, or raster pattern generator)
RPM (revolutions per minute or Red Hat Package Manager)
RRAS (routing and remote access service)
RRD (removable rigid disk)
RS-449 (Recommended Standard-449)
RSAC (Recreational Software Advisory Council)
RSAT (remote server administration tools or regulatory sequence analysis tools)
RSL (Rambus signaling level)
RSS (Really Simple Syndication, or Relay Spam Stopper)
RT (real-time or retweet)
RTC (real-time clock)
RTDM (read the damn manual)
RTF (Rich Text Format)
RTFM (read the f****** manual)
RTOS (Real-time Operating System)
RTR (RARE technical report)
RTS (real-time strategy or Request to Send)
RTSP (Real Time Streaming Protocol)
RTTTL (Ringing Tone Text Transfer Language)
RUT (are you there?)
RVR (realm vs. realm)
RWD (responsive web design)
RXD (received data)


S2R (send to receive)
SaaS (Software as a Service)
SACD (Super Audio CD)
SAN (storage area network)
SANE (Standard Apple Numeric Environment or Scanner Access Now Easy)
SAP (Service Advertising Protocol or Session Announcement Protocol)
SAS (Serial Attached SCSI or Standalone Server)
SATA (Serial AT Attachment)
SATAN (Security Administrator Tool for Analyzing Networks)
SBE (Small Business Edition)
SC (Service Controller, StarCraft, or Supercomputing Conference)
SCA (Single Connector Attachment)
Scanf (scan formatted)
SCC (Serial Communications Controller or shipping container code)
SCCM (system center configuration manager)
SCOM (System Center Operations Manager)
ScrLk (Scroll Lock key)
SCSI (small computer system interface)
SD (Secure Digital, single-sided diskette, single-density diskette, or standard definition)
SDDL (Security Descriptor Definition Language)
SDHC card (Secure Digital High Capacity card)
SDK (software development kit)
SDLC (synchronous data link control or systems development life cycle)
SDLT (super digital linear tape)
SDRAM (synchronous DRAM)
SDSL (symmetrical DSL)
SDU (service data unit)
SE (search engine or second edition)
SEA (self-extracting archive)
SECC (single edge contact cartridge)
SELinux (Security-Enhanced Linux)
SEO (search engine optimization)
Serial no. (serial number)
SERP (search engine results page)
Servlet (Java servlet)
SETI (Search for Extraterrestrial Intelligence)
Setuid (set user ID on execution)
Sexp or sexpr (s-expression)
SFF (small form factor)
SFTP (Secure File Transfer Protocol or SSH File Transfer Protocol)
SFW (safe for work)
SFX (special effects, or sound effects)
SGD (speech-generating device)
SGML (Standard Generalized Markup Language)
SHV connector (safe high-voltage connector)
Sig (signature)
SIGINT (signal interrupt or Signals Intelligence)
Sim (simulation)
SIM card (Subscriber Identity Module card)
SIMD (single instruction, multiple data)
SIMM (single inline memory module)
SIO (super input/output)
SIP (single in-line package)
SLA (sealed lead-acid, or service-level agreement)
SLI (Scalable Link Interface)
SLIP (Serial Line Internet Protocol)
Slogin (secure login)
Slotket (socket adapter)
SLSI (super-large scale integration)
SMAR (source memory address register)
SMART (Self-Monitoring Analysis and Reporting Technology)
SMB (server message block, system management bus, or Super Mario Bros.)
SMBus (System Management Bus)
SM card (SmartMedia card)
SMI (System Management Interrupt, or Simple Mail Interface)
SMIL (Synchronized Multimedia Integration Language)
SMM (System Management Mode)
SMP (symmetric multiprocessing)
SMPS (switched-mode power supply)
SMRAM (System Management RAM)
SMS (short message service, storage management subsystem, or system management server)
SMT (Surface-mount Technology)
SMTP (Simple Mail Transfer Protocol)
SNA (Systems Network Architecture)
SNMP (Simple Network Management Protocol)
SOA (service-oriented architecture or start of authority)
SOAP (Simple Object Access Protocol)
SoC (system on a chip)
SO-DIMM (small outline dual in-line memory module)
SOHO (small office/home office)
SOI (silicon on insulator)
SOL (Solitaire, s*** out of luck)
SONET (synchronous optical networking)
SOP (super operator, or standard operating procedure)
Source (source code)
SP (service pack or spelling)
SPARC (Scalar Processor Architecture)
SPD (Serial Presence Detection)
S/PDIF (Sony and Phillips Digital Interconnect Format)
Spec (specification)
SPI (serial peripheral interface, stateful packet inspection, or system packet interface)
SPIM (spam over instant message)
Spit (Spam over Internet Telephony)
SPL (systems programming language)
splogs (spam blogs)
Spool (simultaneous peripheral operatings online)
SPP (Standard Parallel Port)
SPS (Standard Power Supply)
SQL (Structured Query Language)
SRAM (static random access memory)
SS (screenshot, South Sudan)
SSAP (Source Service Access Point)
SSD (solid-state drive)
SSE (Simple Sharing Extension or Streaming SIMD Extensions)
SSEM (Small Scale Experimental Machine)
SSI (Server Side Include or small-scale integration)
SSID (service set identifier)
SSL (Secure Sockets Layer)
SSL (Space Sciences Laboratory, UC Berkeley)
SSP (storage service provider or System support program)
SSR (solid-state relay)
SSTP (Secure Socket Tunneling Protocol)
Stdin (standard input)
STM (Synchronous Transport Module)
STN (supertwisted nematic)
STP (Spanning Tree Protocol, shielded twisted pair, or software test plan)
STR (Suspend-to-RAM or send to receive)
STS (synchronous transport signal)
Sub (subscript)
Subnet (subnetwork) mask
SUID (set user ID)
Sup (superscript)
SVCD (Super Video CD)
SVGA (Super Video Graphics Array)
S-Video (Super Video)
SW (software)
SXGA (Super Extended Graphics Array)
SXGA+ (Super XGA Plus)
SYN (synchronize)
sync (synchronize)
synth (synthesizer)
sysgen (system generation)
syslog (system log)
sysop (system operator)
sysrq (system request)


TA (terminal adapter)
Ta (Tantalum)
TACACS (Terminal Access Controller Access Control System)
TAPI (Telephony Application Programming Interface)
TAR (tape archive)
TCO (total cost of ownership)
TCPA (Trusted Computer Platform Alliance)
TCP/IP (Transmission Control Protocol/Internet Protocol)
TD (table data)
TDD (telecommunications device for the deaf)
TDM (team deathmatch)
TDP (thermal design power or thermal design point)
Tech (technology)
Telco line (telecommunications line)
TERA (The Exiled Ream of Arborea)
TET (text enhancement technology)
Texel (texture element)
TFS (Team Foundation Server or three-finger salute)
TFTP (Trivial File Transfer Protocol)
TH (table head)
THD (total harmonic distortion)
Ti (Tebi, Titanium, or Textas Instruments)
TIFF (Tagged Image File Format)
TIGA (Texas Instruments Graphics Architecture)
Tk (toolkit)
T&L (transform, clipping, and lighting)
TLD (top-level domain)
TLP (thread-level parallelism)
TLS (Transport Layer Security)
TM (trademark)
TN (twisted nematic)
TOF (top of file)
TOPS (transparent operating system)
Tor (The Onion Router)
TOS (tape operating system, teacher over shoulder, terms of service, terms of use, or type of service)
TPI (tracks per inch)
TPM (Trusted Platform Module)
TP-PMD (Twisted-Pair Physical Medium Dependant)
TR (technical report)
Transistor (transfer resistance)
Triple DEA (Tripple Data Encryption Algorithm)
TRS (Tandy Radio Shack or Telecommunications Relay Service)
TSR (terminate-and-stay-resident)
TT (Turing test)
TTFB (time to first byte)
TTL (time to live, or transistor-transistor logic)
TTS (text-to-speech)
TTY (teletypewriter or teletype)
TV (television)
TXD (trasmit data)


UA (user agent)
UAC (User Account Control)
Uarch (microarchitecture)
UART (Universal Asynchronous Receiver-Transmitter)
UBCD (Ultimate Boot CD)
UC (uppercase)
UCE (unsolicited commercial e-mail)
UDF (Universal Disk Format, user-defined font, or user-defined function)
UDID (Unique Device Identification)
UDMA (Ultra Direct Memory Access)
UDP (User Datagram Protocol)
UDSL (unidirectional DSL)
UEFI (Unified Extensible Firmware Interface)
UHCI (Universal Host Controller Interface)
UHD (Ultra High Definition)
UI (user interface)
U/L (upload)
UL (upload, uplink, or Underwriters Laboratories)
UL (unordered list)
ULSI (Ultra Large Scale Integration)
UMA (Upper Memory Area)
UMB (upper memory block)
UNC (Uniform Naming Convention or Universal Naming Convention)
UNIVAC (Universal Automatic Computer)
UPC (universal product code)
UPI (User Program Interface)
UPnP (Universal Plug and Play)
UPS (uninterruptible power supply or United Parcel Service)
URC (Uniform Resource Characteristic)
URI (Uniform Resource Identifier)
URL (Uniform Resource Locator)
URN (Uniform Resource Name)
USB (universal serial bus)
USMT (User State Migration Tool)
USP (unique selling point)
USR (user, or U.S. Robotics)
USRT (Universal Synchronous Receiver-Transmitter)
USWC (uncachable speculative write combining)
UT (Universal Time)
UTC (Coordinated Universal Time)
UTF (Unicode Transformation Format)
UTM (Unified Threat Management, universal Turing machine, Urchin Tracking Module)
UTP (unshielded twisted pair) cable
Uuencode (Unix-to-Unix encode)
UUID (universal unique identifier)
UV (ultraviolet)
UWIN (University of Washington Information Navigator)
UX (user experience)
UXGA (Ultra Extended Graphics Array)


VA (virtual address)
VAC (Valve Anti-Cheat)
VADSL (very high bit rate asymmetric digital subscriber line)
VAN (value-added network)
VAR (value-added reseller)
VB (Visual Basic)
VBR (variable bitrate or volume boot record)
VBScript (Microsoft Visual Basic Scripting Edition)
VBV (video buffering verifier)
VC (venture capital, videoconferencing, virtual circuit, or version control)
VCEG (Video Coding Experts Group or Visual Coding Experts Group)
VCI (virtual circuit identifier)
VCPI (virtual control program interface)
VCR (video cassette recorder)
VDC (voltage direct current or video display controller)
VDD (virtual device driver, virtual disk drive)
VDSL (very high data rate DSL)
VDU (visual display unit or video display unit)
Ver (Version)
Veronica (Very Easy Rodent-Oriented Net-wide Index to Computer Archives)
VESA (Video Electronics Standard Association)
VGA (Video Graphics Array or Video Graphics Adapter)
VHDL (VHSIC Hardware Description Language )
VHF (very high frequency)
Vhost (virtual host)
VHS (Video Home System)
VIM (Vendor Independent Messaging)
VIP (very important person)
VLAN (virtual local area network)
VLB (Vesa Local Bus)
VL Bus (Vesa Local Bus)
VLC (VideoLAN)
VLSI (very-large-scale integration)
VM (virtual machine, virtual memory, or voicemail)
VMEbus (Versa Module Eurocard bus)
VMM (Virtual Machine Manager or Virtual Machine Monitor)
VMS (virtual memory system or voicemail system)
VNC (Virtual Network Computing)
VOD (video on demand)
VoIP (Voice over Internet Protocol)
VoMM (eVade o' Matic Module)
VPN (virtual private network)
VPS (virtual private server)
VR (virtual reality)
VRAM (video random access memory)
VRLA (valve-regulated lead-acid)
VRM (voltage regulator module)
VRML (Virtual Reality Modeling Language)
Vs (versus or Visual Studio)
VSAM (virtual storage access method or virtual storage access memory)
VTuber (Virtual YouTuber)


W (width)
W3C (World Wide Web Consortium)
WAIS (Wide Area Information Server)
WAN (wide area network)
WAP (Wireless Application Protocol or wireless access point)
WARP (Warning, Advice and Reporting Point)
WBEM (Web-based Enterprise Management)
WCDMA (Wideband Code Division Multiple Access)
WCN (Windows Connect Now)
WD (Western Digital, working directory, or working draft)
WDF (Window Driver Foundation or Windows Driver Frameworks)
Web app (web application)
WEP (Wired Equivalent Privacy)
WFM (Wired for Management)
WFP (Windows File Protection)
WGA (Windows Genuine Advantage)
WiMAX (Worldwide Interoperability for Microwave Access)
Windows PE (Windows Pre-install Environment)
Winsock (Windows socket)
WISP (wireless Internet service provider)
WMF (Windows metafile format or Wikimedia Foundation)
WMI (Windows Management Instrumentation)
WML (Wireless Markup Language or Website META Language)
WOL (Wake-on-LAN)
WOTD (word of the day)
WOW (Windows on Windows or World of Warcraft)
WP (word processor or WordPress)
Wpcomp (write pre-comp or word processing competency)
WQXGA (Wide Quad Extended Graphics Array)
WRAM (Windows RAM)
WSXGA (Widescreen Super eXtended Graphics Array)
WTF (what the f***)
WTH (what the hell)
WWW (World Wide Web)
WYSIWYG (what you see is what you get)
WYSIWYP (what you see is what you print)


X (X Window System)
X11 (X Window System)
XDF (extended density format)
XGA (Extended Graphics Array)
XHTML (Extensible Hypertext markup Language)
XML (Extensible Markup Language)
XMPP (Extensible Messaging and Presence Protocol)
XMS (extended memory specification)
XPM (XP mode)
XSL (Extensible Stylesheet Language)
XSLT (Extensible Stylesheet Language Transformations)
XSS (cross-site scripting)
XT (extended technology)


Y2K (year 2000)
YAML (YAML Ain't Markup Language)
YAUN (yet another Unix nerd)
YT (you there or YouTube)


ZB (zettabyte)
ZCS (Zimbra Collaboration Suite)
ZiB (zebibyte)
ZIF (zero insertion force)
ZIP (Zone Information Protocol or Zoning Improvement Plan)
ZIPI (Zeta Instruments Processor Interface)
ZV port (zoomed video port)

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