List Of Computing And IT Abbreviations

This is a list of computing and IT acronyms, initialisms and abbreviations.

0–9

* 1GL—First-Generation Programming Language
* 1NF—First Normal Form
* 10B2—10BASE-2
* 10B5—10BASE-5
* 10B-F—10BASE-F
* 10B-FB—10BASE-FB
* 10B-FL—10BASE-FL
* 10B-FP—10BASE-FP
* 10B-T—10BASE-T
* 100B-FX—100BASE-FX
* 100B-TX—100BASE-TX
* 100BVG—100BASE-VG
* 286—Intel 80286 processor
* 2B1Q—2 Binary 1 Quaternary
* 2FA—Two-factor authentication
* 2GL—Second-Generation Programming Language
* 2NF—Second Normal Form
* 3GL—Third-Generation Programming Language
* 3GPP—3rd Generation Partnership Project-'3G comms
* 3GPP2—3rd Generation Partnership Project 2
* 3NF—Third Normal Form
* 386—Intel 80386 processor
* 486—Intel 80486 processor
* 4B5BLF—4 Byte 5 Byte Local Fiber
* 4GL—Fourth-Generation Programming Language
* 4NF—Fourth Normal Form
* 5GL—Fifth-Generation Programming Language
* 5NF—Fifth Normal Form
* 6NF—Sixth Normal Form
* 8B10BLF—8 Byte 10 Byte Local Fiber
* 802.11—Wireless LAN

A

* AAA—Authentication Authorization, Accounting
* AABB—Axis Aligned Bounding Box
* AAC—Advanced Audio Coding
* AAL—ATM Adaptation Layer
* AALC—ATM Adaptation Layer Connection
* AARP—AppleTalk Address Resolution Protocol
* ABAC—Attribute-Based Access Control
* ABCL—Actor-Based Concurrent Language
* ABI—Application Binary Interface
* ABM—Asynchronous Balanced Mode
* ABR—Area Border Router
* ABR—Auto Baud-Rate detection
* ABR—Available Bitrate
* ABR—Average Bitrate
* AC—Acoustic Coupler
* AC—Alternating Current
* ACD—Automatic Call Distributor
* ACE—Advanced Computing Environment
* ACID—Atomicity Consistency Isolation Durability
* ACK—ACKnowledgement
* ACK—Amsterdam Compiler Kit
* ACL—Access Control List
* ACL—Active Current Loop
* ACM—Association for Computing Machinery
* ACME—Automated Classification of Medical Entities
* ACP—Airline Control Program
* ACPI—Advanced Configuration and Power Interface
* ACR—Allowed Cell Rate
* ACR—Attenuation to Crosstalk Ratio
* AD—Active Directory
* AD—Administrative Domain
* ADC—Analog-to-Digital Converter
* ADC—Apple Display Connector
* ADB—Apple Desktop Bus
* ADCCP—Advanced Data Communications Control Procedures
* ADO—ActiveX Data Objects
* ADSL—Asymmetric Digital Subscriber Line
* ADT—Abstract Data Type
* AE—Adaptive Equalizer
* AES—Advanced Encryption Standard
* AF—Anisotropic Filtering
* AFP—Apple Filing Protocol
* AGP—Accelerated Graphics Port
* AH—Active Hub
* AI—Artificial Intelligence
* AIX—Advanced Interactive eXecutive
* Ajax—Asynchronous JavaScript and XML
* AL—Active Link
* AL—Access List
* ALAC—Apple Lossless Audio Codec
* ALGOL—Algorithmic Language
* ALSA—Advanced Linux Sound Architecture
* ALU—Arithmetic and Logical Unit
* AM—Access Method
* AM—Active Matrix
* AMOLED—Active-Matrix Organic Light-Emitting Diode
* AM—Active Monitor
* AM—Allied Mastercomputer
* AM—Amplitude Modulation
* AMD—Advanced Micro Devices
* AMQP—Advanced Message Queuing Protocol
* AMR—Audio Modem Riser
* ANN—Artificial Neural Network
* ANSI—American National Standards Institute
* ANT—Another Neat Tool
* AoE—ATA over Ethernet
* AOP—Aspect-Oriented Programming
* APCI—Application-Layer Protocol Control Information
* API—Application Programming Interface
* APIC—Advanced Programmable Interrupt Controller
* APIPA—Automatic Private IP Addressing
* APL—A Programming Language
* APR—Apache Portable Runtime
* ARC—Adaptive Replacement Cache
* ARC—Advanced RISC Computing
* ARIN—American Registry for Internet Numbers
* ARM—Advanced RISC Machines
* AROS—AROS Research Operating System
* ARP—Address Resolution Protocol
* ARPA—Address and Routing Parameter Area
* ARPA—Advanced Research Projects Agency
* ARPANET—Advanced Research Projects Agency Network
* AS—Access Server
* ASCII—American Standard Code for Information Interchange
* AuthIP—Authenticated Internet Protocol
* ASG—Abstract Semantic Graph
* ASIC—Application-Specific Integrated Circuit
* ASIMO—Advanced Step in Innovative Mobility
* ASLR—Address Space Layout Randomization
* ASM—Algorithmic State Machine
* ASMP—Asymmetric Multiprocessing
* ASN.1—Abstract Syntax Notation 1
* ASP—Active Server Pages
* ASP—Application Service Provider
* ASR—Asynchronous Signal Routine
* AST—Abstract Syntax Tree
* AT—Advanced Technology
* AT—Access Time
* AT—Active Terminator
* ATA—Advanced Technology Attachment
* ATAG—Authoring Tool Accessibility Guidelines
* ATAPI—Advanced Technology Attachment Packet Interface
* ATM—Asynchronous Transfer Mode
* AuthN—Authentication
* AuthZ—Authorization
* AV—Antivirus
* AVC—Advanced Video Coding
* AVI—Audio Video Interleaved
* AWK—Aho Weinberger Kernighan
* AWS—Amazon Web Services
* AWT—Abstract Window Toolkit

B

* B2B—Business-to-Business
* B2C—Business-to-Consumer
* B2E—Business-to-Employee
* BAL—Basic Assembly Language
* BAM—Block Availability Map
* Bash—Bourne-again shell
* BASIC—Beginner's All-Purpose Symbolic Instruction Code
* BBP—Baseband Processor
* BBS—Bulletin Board System
* BC—Business Continuity
* BCC—Blind Carbon Copy
* BCD—Binary Coded Decimal
* BCD—Boot Configuration Data
* BCNF—Boyce–Codd normal form
* BCP—Business Continuity Planning
* BE—Backend
* BEEP—Blocks Extensible Exchange Protocol
* BER—Bit Error Rate
* BFD—Bidirectional Forwarding Detection
* BFD—Binary File Descriptor
* BFS—Breadth-First Search
* BFT—Byzantine Fault Tolerant
* BGP—Border Gateway Protocol
* BI—Business Intelligence
* BiDi—Bi-Directional
* bin—binary
* BINAC—Binary Automatic Computer
* BIND—Berkeley Internet Name Domain
* BIOS—Basic Input Output System
* BJT—Bipolar Junction Transistor
* bit—binary digit
* Blob—Binary large object
* Blog—Web Log
* BMP—Basic Multilingual Plane
* BNC—Baby Neill Constant
* BOINC—Berkeley Open Infrastructure for Network Computing
* BOM—Byte Order Mark
* BOOTP—Bootstrap Protocol
* BPDU—Bridge Protocol Data Unit
* BPEL—Business Process Execution Language
* BPL—Broadband over Power Lines
* BPM—Business Process Management
* BPM—Business Process Modeling
* bps—bits per second
* BRM—Business Reference Model
* BRMS—Business Rule Management System
* BRR—Business Readiness Rating
* BRS—Broadband Radio Service
* BSA—Business Software Alliance
* BSB—Backside Bus
* BSD—Berkeley Software Distribution
* BSoD—Blue Screen of Death
* BSS—Block Started by Symbol
* BT—BitTorrent
* BT—Bluetooth
* B TAM—Basic Telecommunications Access Method
* BW—Bandwidth
* BYOD—Bring Your Own Device
* Byte—By eight (group of 8 bits)

C

* CA—Computer Accountancy
* CAD—Computer-Aided Design
* CAE—Computer-Aided Engineering
* CAID—Computer-Aided Industrial Design
* CAI—Computer-Aided Instruction
* CAM—Computer-Aided Manufacturing
* CAP—Consistency Availability Partition tolerance (theorem)
* CAPTCHA—Completely Automated Public Turing Test to tell Computers and Humans Apart
* CAT—Computer-Aided Translation
* CAQ—Computer-Aided Quality Assurance
* CASE—Computer-Aided Software Engineering
* cc—C Compiler
* CC—Carbon Copy
* CD—Compact Disc
* CDE—Common Desktop Environment
* CDFS—Compact Disk File System
* CDMA—Code-Division Multiple Access
* CDN—Content Delivery Network
* CDP—Cisco Discovery Protocol
* CDP—Continuous Data Protection
* CD-R—CD-Recordable
* CD-ROM—CD Read-Only Memory
* CD-RW—CD-Rewritable
* CDSA—Common Data Security Architecture
* CERT—Computer Emergency Response Team
* CES—Consumer Electronics Show
* CF—Compact Flash
* CFD—Computational Fluid Dynamics
* CFG—Context-Free Grammar
* CFG—Control-Flow Graph
* CG—Computer Graphics
* CGA—Color Graphics Array
* CGI—Common Gateway Interface
* CGI—Computer-Generated Imagery
* CGT—Computational Graph Theory
* CHAP—Challenge-Handshake Authentication Protocol
* CHS—Cylinder-Head-Sector
* CIDR—Classless Inter-Domain Routing
* CIFS—Common Internet Filesystem
* CIM—Common Information Model
* CIM—Computationally Independent Model
* CIO—Chief Information Officer
* CIR—Committed information rate
* CISC—Complex Instruction Set Computer
* CJK—Chinese, Japanese, and Korean
* CJKV—Chinese, Japanese, Korean, and Vietnamese
* CLI—Command Line Interface
* CLR—Common Language Runtime
* CM—Configuration Management
* CM—Content Management
* CMDB—Configuration Management Database
* CMMI—Capability Maturity Model Integration
* CMOS—Complementary Metal-Oxide Semiconductor
* CMO—Current Mode of Operation
* CMS—Content Management System
* CN—Canonical Name
* CN—Common Name
* CNC—Computer Numerical Control
* CNG—Cryptographic Next Generation
* CNG—Cryptography Next Generation
* CNR—Communications and Networking Riser
* COBOL—Common Business-Oriented Language
* COM—Component Object Model or communication
* CORBA—Common Object Request Broker Architecture
* CORS—Cross-Origin Resource Sharing
* COTS—Commercial Off-The-Shelf
* CPA—Cell Processor Architecture
* CPAN—Comprehensive Perl Archive Network
* CP/M—Control Program/Monitor
* CPRI—Common Public Radio Interface
* CPS—characters per second
* CPU—Central Processing Unit
* CQS—Command–query separation
* CQRS—Command Query Responsibility Segregation
* CR—Carriage Return
* CRAN—Comprehensive R Archive Network
* CRC—Cyclic Redundancy Check
* CRLF—Carriage Return Line Feeds
* CRM—Customer Relationship Management
* CRS—Computer Reservations System
* CRT—Cathode-Ray Tube
* CRUD—Create, Read, Update and Delete
* CS—Cable Select
* CS—Computer Science
* CSE—Computer Science and Engineering
* CSI—Common System Interface
* CSM—Compatibility Support Module
* CSMA/CD—Carrier-sense multiple access with collision detection
* CSP—Cloud Service Provider
* CSP—Communicating Sequential Processes
* CSRF—Cross-Site Request Forgery
* CSS—Cascading Style Sheets
* CSS—Content-Scrambling System
* CSS—Closed Source Software
* CSS—Cross-Site Scripting
* CSV—Comma-Separated Values
* CT—Computerized Tomography
* CTAN—Comprehensive TeX Archive Network
* CTCP—Client-To-Client Protocol
* CTI—Computer Telephony Integration
* CTFE—Compile-time function execution
* CTL—Computational Tree Logic
* CTM—Close To Metal
* CTS—Clear To Send
* CTSS—Compatible Time-Sharing System
* CUA—Common User Access
* CVE—Common Vulnerabilities and Exposures
* CVS—Concurrent Versioning System
* CX—Customer Experience

D

* DAC—Digital-To-Analog Converter
* DAC—Discretionary Access Control
* DAL—Database Abstraction Layer
* DAO—Data Access Object
* DAO—Data Access Objects
* DAO—Disk-At-Once
* DAP—Directory Access Protocol
* DARPA—Defense Advanced Research Projects Agency
* DAS—Direct Attached Storage
* DAT—Digital Audio Tape
* DB—Database
* DSKT—Desktop
* DBA—Database Administrator
* DBCS—Double Byte Character Set
* DBMS—Database Management System
* DCC—Direct Client-to-Client
* DCCP—Datagram Congestion Control Protocol
* DCCA—Debian Common Core Alliance
* DCL—Data Control Language
* DCS—Distributed Control System
* DCMI—Dublin Core Metadata Initiative
* DCOM—Distributed Component Object Model
* DD—Double Density
* DDE—Dynamic Data Exchange
* DDI—DNS DHCP & IP Address management
* DDL—Data Definition Language
* DDoS—Distributed Denial of Service
* DDR—Double Data Rate
* DEC—Digital Equipment Corporation
* DES—Data Encryption Standard
* dev—development
* DFA—Deterministic Finite Automaton
* DFD—Data Flow Diagram
* DFS—Depth-First Search
* DFS—Distributed File System
* DGD—Dworkin's Game Driver
* DHCP—Dynamic Host Configuration Protocol
* DHTML—Dynamic Hypertext Markup Language
* DIF—Data Integrity Field
* DIMM—Dual Inline Memory Module
* DIN—Deutsches Institut für Normung
* DIP—Dual In-line Package
* DISM—Deployment Image and Service Management Tool
* DIVX—Digital Video Express
* DKIM—Domain Keys Identified Mail
* DL—Download
* DLL—Dynamic Link Library
* DLNA—Digital Living Network Alliance
* DMA—Direct Memory Access
* DMCA—Digital Millennium Copyright Act
* DMI—Direct Media Interface
* DML—Data Manipulation Language
* DML—Definitive Media Library
* DMR—Dennis M. Ritchie
* DMZ—Demilitarized Zone
* DN—Distinguished Name
* DND—Drag-and-Drop
* DNS—Domain Name System
* DOA—Dead on Arrival
* DOCSIS—Data Over Cable Service Interface Specification
* DOM—Document Object Model
* DoS—Denial of Service
* DOS—Disk Operating System
* DP—Dot Pitch
* DPC—Deferred Procedure Call
* DPI—Deep Packet Inspection
* DPI—Dots Per Inch
* DPMI—DOS Protected Mode Interface
* DPMS—Display Power Management Signaling
* DR—Disaster Recovery
* DRAM—Dynamic Random-Access Memory
* DR-DOS—Digital Research - Disk Operating System
* DRI—Direct Rendering Infrastructure
* DRM—Digital Rights Management
* DRM—Direct Rendering Manager
* DSA—Digital Signature Algorithm
* DSDL—Document Schema Definition Languages
* DSDM—Dynamic Systems Development Method
* DSL—Digital Subscriber Line
* DSL—Domain-Specific Language
* DSLAM—Digital Subscriber Line Access Multiplexer
* DSN—Database Source Name
* DSN—Data Set Name
* DSP—Digital Signal Processor
* DSSSL—Document Style Semantics and Specification Language
* DTD—Document Type Definition
* DTE—Data Terminal Equipment or data transfer rate
* DTO—Data Transfer Object
* DTP—Desktop Publishing
* DTR—Data Terminal Ready or Data transfer rate
* DVD—Digital Versatile Disc or Digital Video Disc
* DVD-R—DVD-Recordable
* DVD-ROM—DVD-Read Only Memory
* DVD-RW—DVD-Rewritable
* DVI—Digital Visual Interface
* DVR—Digital Video Recorder
* DW—Data Warehouse

E

* EAI—Enterprise Application Integration
* EAP—Extensible Authentication Protocol
* EAS—Exchange ActiveSync
* EBCDIC—Extended Binary Coded Decimal Interchange Code
* EBML—Extensible Binary Meta Language
* ECC—Elliptic Curve Cryptography
* ECMA—European Computer Manufacturers Association
* ECN—Explicit Congestion Notification
* ECOS—Embedded Configurable Operating System
* ECRS—Expense and Cost Recovery System
* ECS—Entity-Component-System
* EDA—Electronic Design Automation
* EDGE—Enhanced Data rates for GSM Evolution
* EDI—Electronic Data Interchange
* EDO—Extended Data Out
* EDSAC—Electronic Delay Storage Automatic Calculator
* EDVAC—Electronic Discrete Variable Automatic Computer
* EEPROM—Electronically Erasable Programmable Read-Only Memory
* EFF—Electronic Frontier Foundation
* EFI—Extensible Firmware Interface
* EFM—Eight-to-Fourteen Modulation
* EFM—Ethernet in the First Mile
* EFS—Encrypting File System
* EGA—Enhanced Graphics Array
* E-mail—Electronic mail
* EGP—Exterior Gateway Protocol
* eID—electronic ID card
* EIDE—Enhanced IDE
* EIGRP—Enhanced Interior Gateway Routing Protocol
* EISA—Extended Industry Standard Architecture
* ELF—Extremely Low Frequency
* ELF—Executable and Linkable Format
* ELM—ELectronic Mail
* EMACS—Editor MACroS
* EMS—Expanded Memory Specification
* ENIAC—Electronic Numerical Integrator And Computer
* EOD—End of Day
* EOF—End of File
* EOL—End of Life
* EOL—End of Line
* EOM—End of Message
* EOS—End of Support
* EPIC—Explicitly Parallel Instruction Computing
* EPROM—Erasable Programmable Read-Only Memory
* ERD—Entity-Relationship Diagram
* ERM—Entity-Relationship Model
* ERP—Enterprise Resource Planning
* eSATA—external SATA
* ESB—Enterprise service bus
* ESCON—Enterprise Systems Connection
* ESD—Electrostatic Discharge
* ESI—Electronically Stored Information
* ESR—Eric Steven Raymond
* ETL—Extract, Transform, Load
* ETW—Event Tracing for Windows
* EUC—Extended Unix Code
* EULA—End User License Agreement
* EWM—Enterprise Work Management
* EWMH—Extended Window Manager Hints
* EXT—EXTended file system
* ETA—Estimated Time of Arrival

F

* FAP—FORTRAN Assembly Program
* FASM—Flat ASseMbler
* FAT—File Allocation Table
* FAQ—Frequently Asked Questions
* FBDIMM—Fully Buffered Dual Inline Memory Module
* FC-AL—Fibre Channel Arbitrated Loop
* FCB—File Control Block
* FCS—Frame Check Sequence
* FDC—Floppy-Disk Controller
* FDS—Fedora Directory Server
* FDD—Frequency-Division Duplexing
* FDD—Floppy Disk Drive
* FDDI—Fiber Distributed Data Interface
* FDM—Frequency-Division Multiplexing
* FDMA—Frequency-Division Multiple Access
* FE—Frontend
* FEC—Forward Error Correction
* FEMB—Front-End Motherboard
* FET—Field Effect Transistor
* FHS—Filesystem Hierarchy Standard
* FICON—FIber CONnectivity
* FIFO—First In First Out
* FIPS—Federal Information Processing Standards
* FL—Function Level
* FLAC—Free Lossless Audio Codec
* FLOPS—FLoating-Point Operations Per Second
* FLOSS—Free/Libre/Open-Source Software
* FMC—Fixed Mobile Convergence "Mobile UC or Unified Communications over Wireless"
* FMO—Future Mode of Operation
* FOLDOC—Free On-line Dictionary of Computing
* FORTRAN—Formula Translation
* FOSDEM—Free and Open-source Software Developers' European Meeting
* FOSI—Formatted Output Specification Instance
* FOSS—Free and Open-Source Software
* FP—Function Programming
* FP—Functional Programming
* FPGA—Field Programmable Gate Array
* FPS—Floating Point Systems
* FPU—Floating-Point Unit
* FRU—Field-Replaceable Unit
* FS—File System
* FSB—Front-Side Bus
* fsck—File System Check
* FSF—Free Software Foundation
* FSM—Finite State Machine
* FTTA—Fiber To The Antenna
* FTTC—Fiber To The Curb
* FTTH—Fiber To The Home
* FTTP—Fiber To The Premises
* FTP—File Transfer Protocol
* FQDN—Fully Qualified Domain Name
* FUD—Fear Uncertainty Doubt
* FWS—Folding White Space
* FXP—File eXchange Protocol
* FYI—For Your Information
* FVEK—Full Volume Encryption Key

G

* G11N—Globalization
* Gas—GNU Assembler
* Gb—Gigabit
* GB—Gigabyte
* Gbps—Gigabits per second
* GCC—GNU Compiler Collection
* GCJ—GNU Compiler for Java
* GCP—Google Cloud Platform
* GCR—Group Coded Recording
* GDB—GNU Debugger
* GDI—Graphics Device Interface
* GFDL—GNU Free Documentation License
* GIF—Graphics Interchange Format
* GIGO—Garbage In, Garbage Out
* GIMP—GNU Image Manipulation Program
* GIMPS—Great Internet Mersenne Prime Search
* GIS—Geographic Information System
* GLUT—OpenGL Utility Toolkit
* GML—Geography Markup Language
* GNOME—GNU Network Object Model Environment
* GNU—GNU's Not Unix
* GOMS—Goals, Operators, Methods, and Selection rules
* GPASM—GNU PIC ASseMbler
* GPFS—General Parallel File System
* GPG—GNU Privacy Guard
* GPGPU—General-Purpose Computing on Graphics Processing Units
* GPIB—General-Purpose Instrumentation Bus
* GPL—General Public License
* GPL—General-Purpose Language
* GPRS—General Packet Radio Service
* GPT—GUID Partition Table
* GPU—Graphics Processing Unit
* GRUB—Grand Unified Boot-Loader
* GERAN—GSM EDGE Radio Access Network
* GSM—Global System for Mobile Communications
* GTK+—GIMP Toolkit
* GUI—Graphical User Interface
* GUID—Globally Unique IDentifier
* GWT—Google Web Toolkit
* GYR—IT Networking

H

* HA—High availability
* HAL—Hardware Abstraction Layer
* HARD—HTML Application Rapid Development
* HASP—Houston Automatic Spooling Priority
* HBA—Host Bus Adapter
* HCI—Human—Computer Interaction
* HD—High Density
* HDD—Hard Disk Drive
* HCL—Hardware Compatibility List
* HD DVD—High Definition DVD
* HDL—Hardware Description Language
* HDMI—High-Definition Multimedia Interface
* HECI—Host Embedded Controller Interface
* HF—High Frequency
* HFS—Hierarchical File System
* HHD—Hybrid Hard Drive
* HID—Human Interface Device
* HIG—Human Interface Guidelines
* HIRD—Hurd of Interfaces Representing Depth
* HLASM—High Level ASseMbler
* HLS—HTTP Live Streaming
* HMA—High Memory Area
* HP—Hewlett-Packard
* HPC—High-Performance Computing
* HPFS—High Performance File System
* HSDPA—High-Speed Downlink Packet Access
* HTC—High-Throughput Computing
* HSM—Hierarchical Storage Management
* HT—Hyper Threading
* HTM—Hierarchical Temporal Memory
* HTML—Hypertext Markup Language
* HTTP—Hypertext Transfer Protocol
* HTTPd—Hypertext Transport Protocol Daemon
* HTTPS—HTTP Secure
* HTX—HyperTransport eXpansion
* HURD—Hird of Unix-Replacing Daemons
* HVD—Holographic Versatile Disc
* Hz—Hertz

I

* I²C—Inter-Integrated Circuit
* I²S—Integrated Interchip Sound
* I18N—Internationalization
* IANA—Internet Assigned Numbers Authority
* IaaS—Infrastructure as a Service
* IaC—Infrastructure as Code
* iBCS—Intel Binary Compatibility Standard
* IBM—International Business Machines
* IC—Integrated Circuit
* ICANN—Internet Corporation for Assigned Names and Numbers
* ICE—In-Circuit Emulator
* ICE—Intrusion Countermeasure Electronics
* ICH—I/O Controller Hub
* ICMP—Internet Control Message Protocol
* ICP—Internet Cache Protocol
* ICS—Internet Connection Sharing
* ICT—Information and Communication Technology
* IDE—Integrated Development Environment
* IDE—Integrated Drive Electronics
* IDF—Intermediate Distribution Frame
* IDF—Intermediate Data Format
* IDL—Interactive Data Language
* IDL—Interface Definition Language
* IDS—Intrusion Detection System
* IE—Internet Explorer
* IEC—International Electrotechnical Commission
* IEEE—Institute of Electrical and Electronics Engineers
* IETF—Internet Engineering Task Force
* IFL—Integrated Facility for Linux
* IGMP—Internet Group Management Protocol
* IGRP—Interior Gateway Routing Protocol
* IHV—Independent Hardware Vendor
* IIOP—Internet Inter-Orb Protocol
* IIS—Internet Information Services
* IKE—Internet Key Exchange
* IL—Intermediate Language
* IM—Instant Message or Instant Messaging
* IMAP—Internet Message Access Protocol
* IME—Input Method Editor
* IMR—Internet Monthly Report
* INFOSEC—Information Systems Security
* I/O—Input/output
* IoT—Internet of Things
* IP—Intellectual Property
* IP—Internet Protocol
* IPAM—IP Address Management
* IPC—Inter-Process Communication
* IPL—Initial Program Load
* IPMI—Intelligent Platform Management Interface
* IPO—Inter Procedural Optimization
* IPP—Internet Printing Protocol
* IPS—In-Plane Switching
* IPS—Instructions Per Second
* IPS—Intrusion Prevention System
* IPsec—Internet Protocol security
* IPTV—Internet Protocol Television
* IPv4—Internet Protocol version 4
* IPv6—Internet Protocol version 6
* IPX—Internetwork Packet Exchange
* IR—Intermediate Representation
* IRC—Internet Relay Chat
* IrDA—Infrared Data Association
* IRI—Internationalized Resource Identifier
* IRP—I/O Request Packet
* IRQ—Interrupt Request
* IS—Information Systems
* IS-IS—Intermediate System to Intermediate System
* ISA—Industry Standard Architecture
* ISA—Instruction Set Architecture
* ISAM—Indexed Sequential Access Method
* ISATAP—Intra-Site Automatic Tunnel Addressing Protocol
* ISC—Internet Storm Center
* iSCSI—Internet Small Computer System Interface
* ISDN—Integrated Services Digital Network
* ISO—International Organization for Standardization
* iSNS—Internet Storage Name Service
* ISP—Internet Service Provider
* ISPF—Interactive System Productivity Facility
* ISR—Interrupt Service Routine
* ISV—Independent Software Vendor
* IT—Information Technology
* ITIL—Information Technology Infrastructure Library
* ITL—Interval Temporal Logic
* ITU—International Telecommunication Union
* IVRS—Interactive Voice Response System
* IVCR—Interactive Virtual Classroom
* ISDN—Integrated service digital network

J

* J2EE—Java 2 Enterprise Edition
* J2ME—Java 2 Micro Edition
* J2SE—Java 2 Standard Edition
* JAXB—Java Architecture for XML Binding
* JAX-RPC—Java XML for Remote Procedure Calls
* JAXP—Java API for XML Processing
* JBOD—Just a Bunch of Disks
* JCE Java Cryptography Extension
* JCL—Job Control Language
* JCP—Java Community Process
* JDBC—Java Database Connectivity
* JDK—Java Development Kit
* JEE—Java Enterprise Edition
* JES—Job Entry Subsystem
* JDS—Java Desktop System
* JFC—Java Foundation Classes
* JFET—Junction Field-Effect Transistor
* JFS—IBM Journaling File System
* JINI—Jini Is Not Initials
* JIT—Just-In-Time
* JME—Java Micro Edition
* JMX—Java Management Extensions
* JMS—Java Message Service
* JNDI—Java Naming and Directory Interface
* JNI—Java Native Interface
* JNZ—Jump non-zero
* JPEG—Joint Photographic Experts Group
* JRE—Java Runtime Environment
* JS—JavaScript
* JSE—Java Standard Edition
* JSON—JavaScript Object Notation
* JSP—Jackson Structured Programming
* JSP—JavaServer Pages
* JTAG—Joint Test Action Group
* JVM—Java Virtual Machine

K

* K&R—Kernighan and Ritchie
* KB—Keyboard
* Kb—Kilobit
* KB—Kilobyte
* KB—Knowledge Base
* Kbps—Kilobits per second
* KiB—Kibibyte
* KDE—K Desktop Environment
* kHz—Kilohertz
* KM—Knowledge Machine
* KRL—Knowledge Representation Language
* KVM—Keyboard, Video, Mouse

L

* L10N—Localization
* L2TP—Layer two Tunneling Protocol
* LACP—Link Aggregation Control Protocol
* LAMP—Linux Apache MySQL Perl
* LAMP—Linux Apache MySQL PHP
* LAMP—Linux Apache MySQL Python
* LAN—Local Area Network
* LBA—Logical Block Addressing
* LB—Load Balancer
* LCD—Liquid Crystal Display
* LCR—Least Cost Routing
* LCOS—Liquid Crystal On Silicon
* LDAP—Lightweight Directory Access Protocol
* LE—Logical Extents
* LED—Light-Emitting Diode
* LF—Line Feed
* LF—Low Frequency
* Linux From Scratch, LFS—Linux From Scratch
* GNU Lesser General Public License, LGPL—Lesser General Public License
* Library (computing), LIB—LIBrary
* Low insertion force, LIF—Low Insertion Force
* LIFO (computing), LIFO—Last In First Out
* LILO (boot loader), LILO—Linux Loader
* LIP—Loop Initialization Primitive
* Lisp (programming language), LISP—LISt Processing
* Linux kernel mailing list, LKML—Linux Kernel Mailing List
* LAN Manager, LM—Lan Manager
* Source lines of code, LOC—Lines of Code
* LPC (programming language), LPC—Lars Pensjö C
* Lines Per Inch, LPI—Lines Per Inch
* Linux Professional Institute, LPI—Linux Professional Institute
* Parallel port, LPT Line Print Terminal
* Least Recently Used, LRU—Least Recently Used
* Least significant bit, LSB—Least Significant Bit
* Linux Standard Base, LSB—Linux Standard Base
* Large Scale Integration, LSI—Large-Scale Integration
* Long Term Evolution, LTE—Long Term Evolution
* Linear temporal logic, LTL—Linear Temporal Logic
* Bi-directional text, LTR—Left-to-Right
* Linux User Group, LUG—Linux User Group
* Logical Unit Number, LUN—Logical Unit Number
* Logical volume management, LV—Logical Volume
* Low-voltage differential signaling, LVD—Low Voltage Differential
* Logical volume management, LVM—Logical Volume Management
* Lempel–Ziv–Welch, LZW—Lempel-Ziv-Welch
* Land Grid Array, LGA—Land Grid Array

M

* Mandatory access control, MAC—Mandatory Access Control
* Media Access Control, MAC—Media Access Control
* Mobile ad hoc network, MANET—Mobile Ad-Hoc Network
* Metropolitan area network, MAN—Metropolitan Area Network
* Messaging Application Programming Interface, MAPI—Messaging Application Programming Interface
* Multi-byte character set, MBCS—Multi Byte Character Set
* Model-based design, MBD—Model-Based Design
* Master boot record, MBR—Master Boot Record
* Megabit, Mb—Megabit
* Megabyte, MB—Megabyte
* Megabits per second, Mbps—Megabits per second
* Microsoft Certified Professional#Microsoft Certified Application Developer or M.C.A.D., MCAD—Microsoft Certified Application Developer
* Microsoft Certified Professional#Microsoft Certified Application Specialist or M.C.A.S., MCAS—Microsoft Certified Application Specialist
* Micro Channel architecture, MCA—Micro Channel Architecture
* Microsoft Certified Professional, MCA—Microsoft Certified Architect
* MCDBA—Microsoft Certified DataBase Administrator
* Microsoft Certified Professional#Microsoft Certified Desktop Support Technician or M.C.D.S.T., MCDST—Microsoft Certified Desktop Support Technician
* Microsoft Certified Professional, MCITP—Microsoft Certified Information Technology Professional
* Microsoft Certified Professional, MCM—Microsoft Certified Master
* Multiple Channels Per Carrier , MCPC—Multiple Channels Per Carrier
* Microsoft Certified Professional, MCPD—Microsoft Certified Professional Developer
* Microsoft Certified Professional, MCP—Microsoft Certified Professional
* Microsoft Certified Professional#Microsoft Certified Systems Administrator or M.C.S.A., MCSA—Microsoft Certified Systems Administrator
* Microsoft Certified Professional#Microsoft Certified Solution Developer or M.C.S.D., MCSD—Microsoft Certified Solution Developer
* Microsoft Certified Professional#Microsoft Certified Systems Engineer or M.C.S.E., MCSE—Microsoft Certified Systems Engineer
* Microsoft Certified Professional, MCTS—Microsoft Certified Technology Specialist
* Microsoft Certified Professional#Microsoft Certified Trainer or M.C.T., MCT—Microsoft Certified Trainer
* IBM Monochrome Display Adapter, MDA—Monochrome Display Adapter
* Mail delivery agent, MDA—Mail Delivery Agent
* Model-driven architecture, MDA—Model-Driven Architecture
* Model-driven software development, MDD/MDSD—Model-Driven (Software) Development
* Main distribution frame, MDF—Main Distribution Frame
* Multiple-document interface, MDI—Multiple-Document Interface
* Master Data Management, MDM—Master Data Management
* Microsoft Edge, ME—Microsoft Edge
* Windows Me, ME—[Windows] Millennium Edition
* Multi-factor authentication , MFA—Multi-factor authentication
* Microsoft Foundation Class Library, MFC—Microsoft Foundation Classes
* Modified Frequency Modulation, MFM—Modified Frequency Modulation
* Medium frequency, MF—Medium Frequency
* Media Gateway Control Protocol, MGCP—Media Gateway Control Protocol
* Megahertz, MHz—Megahertz
* Management information base, MIB—Management Information Base
* Magnetic ink character recognition, MICR—Magnetic Ink Character Recognition or Magnetic Ink Character Reader
* Musical Instrument Digital Interface, MIDI—Musical Instrument Digital Interface
* Multiple instruction, multiple data, MIMD—Multiple Instruction, Multiple Data
* MIME—Multipurpose Internet Mail Extensions
* MIMO—Multiple-Input Multiple-Output
* MINIX—MIni-uNIX
* MIPS architecture, MIPS—Microprocessor without Interlocked Pipeline Stages
* Million instructions per second, MIPS—Million Instructions Per Second
* Multiple instruction, single data, MISD—Multiple Instruction, Single Data
* Management information system, MIS—Management Information Systems
* Massachusetts Institute of Technology, MIT—Massachusetts Institute of Technology
* Machine Learning, ML—Machine Learning
* Microsoft Management Console, MMC—Microsoft Management Console
* Mortality Medical Data System, MMDS—Mortality Medical Data System
* Multichannel Multipoint Distribution Service, MMDS—Multichannel Multipoint Distribution Service
* Multi-mode optical fiber, MMF—Multi-Mode (optical) Fiber
* Memory-mapped I/O, MMIO—Memory-Mapped I/O
* Man-machine interface, MMI—Man Machine Interface.
* Massively multiplayer online role-playing game, MMORPG—Massively Multiplayer Online Role-Playing Game
* Multimedia Message Service, MMS—Multimedia Message Service
* Memory management unit, MMU—Memory Management Unit
* MMX (instruction set), MMX—Multi-Media Extensions
* Multiple-image Network Graphics, MNG—Multiple-image Network Graphics
* Motherboard, MoBo—Motherboard
* Message-oriented middleware, MOM—Message-Oriented Middleware
* MOO—MUD Object Oriented
* Metaobject protocol, MOP—Meta-Object Protocol
* MOSFET—Metal-Oxide Semiconductor Field Effect Transistor
* Microsoft Certified Professional#Microsoft Office Specialist or M.O.S., MOS—Microsoft Office Specialist
* Motd (Unix), MOTD—Message Of The Day
* Microsoft Certified Professional, MOUS—Microsoft Office User Specialist
* QuickTime File Format, MOV—Apple QuickTime Multimedia File
* Motion Picture Association of America, MPAA—Motion Picture Association of America
* Moving Picture Experts Group, MPEG—Motion Pictures Experts Group
* Multiprotocol Label Switching, MPLS—Multiprotocol Label Switching
* Mozilla Public License, MPL—Mozilla Public License
* Microprocessor, MPU—Microprocessor Unit
* MS-DOS—Microsoft DOS
* Mail submission agent, MSA—Mail Submission Agent
* Most significant bit, MSB—Most Significant Bit
* Microsoft Developer Network, MSDN—Microsoft Developer Network
* Integrated circuit#MSI, MSI—Medium-Scale Integration
* Message Signaled Interrupts, MSI—Message Signaled Interrupt
* Windows Installer, MSI—Microsoft Installer
* Microsoft Network, MSN—Microsoft Network
* Microsoft, MS—Microsoft
* USB flash drive, MS—Memory Stick
* Message transfer agent, MTA—Mail Transfer Agent
* Microsoft Certified Professional, MTA—Microsoft Technology Associate
* MTBF—Mean Time Between Failures
* Maximum transmission unit, MTU—Maximum Transmission Unit
* Machine translation, MT—Machine Translation
* Mail User Agent, MUA—Mail User Agent
* MUD—Multi-User Dungeon
* Computer memory, MU—Memory Unit
* Model–view–controller, MVC—Model-View-Controller
* Microsoft Most Valuable Professional, MVP—Most Valuable Professional
* MVS—Multiple Virtual Storage
* Mobile World Congress, MWC—Mobile World Congress
* Material Exchange Format, MXF—Material Exchange Format
* MX record, MX—Mail exchange

N

* Network Access Control, NAC—Network Access Control
* Negative-acknowledge character, NACK—Negative ACKnowledgement
* Negative-acknowledge character, NAK—Negative AcKnowledge Character
* NaN—Not a Number
* Network Access Protection, NAP—Network Access Protection
* Network-attached storage, NAS—Network-Attached Storage
* Netwide Assembler, NASM—Netwide ASseMbler
* Network address translation, NAT—Network Address Translation
* NetWare Core Protocol, NCP—NetWare Core Protocol
* Native Command Queuing, NCQ—Native Command Queuing
* National Center for Supercomputing Applications, NCSA—National Center for Supercomputing Applications
* Network Driver Interface Specification, NDIS—Network Driver Interface Specification
* Novell Embedded Systems Technology, NDPS—Novell Distributed Print Services
* Novell Directory Services, NDS—Novell Directory Services
* Network Equipment Provider, NEP—Network Equipment Provider
* NetBIOS—Network Basic Input/Output System
* NetBIOS over TCP/IP, NetBT—NetBIOS over TCP/IP
* Near-end crosstalk, NEXT—Near-End CrossTalk
* Nondeterministic finite automaton, NFA—Nondeterministic Finite Automaton
* Near-field communication, NFC—Near-field communication
* Network File System (protocol), NFS—Network File System
* NGL—aNGeL
* Next-Generation Secure Computing Base, NGSCB—Next-Generation Secure Computing Base
* National Instruments, NI—National Instruments
* Network interface controller, NIC—Network Interface Controller or Network Interface Card
* No Internal Message, NIM—No Internal Message
* Non-blocking I/O (Java), NIO—Non-blocking I/O
* National Institute of Standards and Technology, NIST—National Institute of Standards and Technology
* Non-linear editing system, NLE—Non-Linear Editing system
* Natural language processing, NLP—Natural Language Processing
* Internationalization and localization, NLS—Native Language Support
* Non-maskable interrupt, NMI—Non-Maskable Interrupt
* Network News Transfer Protocol, NNTP—Network News Transfer Protocol
* Network operations center, NOC—Network Operations Center
* NOP (code), NOP—No OPeration
* Network operating system, NOS—Network Operating System
* NP (complexity), NP—Nondeterministic Polynomial time
* Netscape Public License, NPL—Netscape Public License
* Native POSIX Thread Library, NPTL—Native POSIX Thread Library
* Network Processing Unit, NPU—Network Processing Unit
* Netscape, NS—Netscape
* Network Security Appliance, NSA—Network Security Appliance
* Network Service Interface, NSI—Network Service Interface
* Netscape Portable Runtime, NSPR—Netscape Portable Runtime
* Novell Storage Services, NSS—Novell Storage Service
* Network Security Services, NSS—Network Security Services
* Name Service Switch, NSS—Name Service Switch
* Windows NT, NT—New Technology
* NTFS—NT Filesystem
* NTLM—NT Lan Manager
* Network Time Protocol, NTP—Network Time Protocol
* Non-Uniform Memory Access, NUMA—Non-Uniform Memory Access
* Non-uniform rational B-spline, NURBS—Non-Uniform Rational B-Spline
* Network Video Recorder, NVR—Network Video Recorder
* Non-volatile random access memory, NVRAM—Non-Volatile Random Access Memory

O

* OASIS (organization), OASIS—Organization for the Advancement of Structured Information Standards
* Operational Acceptance Testing, OAT—Operational Acceptance Testing
* OBSAI—Open Base Station Architecture Initiative
* Open Database Connectivity, ODBC—Open Database Connectivity
* Original equipment manufacturer, OEM—Original Equipment Manufacturer
* Open Enterprise Server, OES—Open Enterprise Server
* Orthogonal frequency-division multiplexing, OFDM—Orthogonal Frequency-Division Multiplexing
* Open and Free Technology Community, OFTC—Open and Free Technology Community
* Object identifier, OID—Object Identifier
* Online analytical processing, OLAP—Online Analytical Processing
* Object Linking and Embedding, OLE—Object Linking and Embedding
* Organic light-emitting diode, OLED—Organic Light Emitting Diode
* One Laptop per Child, OLPC—One Laptop per Child
* Online transaction processing, OLTP—Online Transaction Processing
* Relocatable Object Module Format, OMF—Object Module Format
* Object Management Group, OMG—Object Management Group
* Optical Mark Recognition, OMR—Optical Mark Reader
* Object-oriented programming, OO—Object-Oriented
* OpenOffice.org, OO—OpenOffice
* Out-of-order execution, OOE—Out-of-Order Execution
* Out of memory, OOM—Out Of Memory
* OpenOffice.org, OOo—OpenOffice.org
* Out-of-order execution, OoOE—Out-of-Order Execution
* Object-oriented programming, OOP—Object-Oriented Programming
* Out of the box (feature), OOTB—Out of the box
* OPML—Outline Processor Markup Language
* Object request broker, ORB—Object Request Broker
* Object-relational mapping, ORM—Object-Relational Mapping
* Open-source software, OS—Open Source
* Operating system, OS—Operating System
* O'Reilly Open Source Convention, OSCON—O'Reilly Open Source CONvention
* OSDN—Open Source Development Network
* Open Source Initiative, OSI—Open Source Initiative
* Open Systems Interconnection, OSI—Open Systems Interconnection
* Open Shortest Path First, OSPF—Open Shortest Path First
* Open Sound System, OSS—Open Sound System
* Open source software, OSS—Open-Source Software
* Operations support system, OSS—Operations Support System
* Open Source Technology Group, OSTG—Open Source Technology Group
* One-time password, OTP—One-time password
* Organizationally Unique Identifier, OUI—Organisationally Unique Identifier

P

* Peer-to-peer, P2P—Peer-To-Peer
* Platform as a service, PaaS—Platform as a Service
* Privileged Access Management, PAM—Privileged Access Management
* Personal area network, PAN—Personal Area Network
* Password authentication protocol, PAP—Password Authentication Protocol
* PARC (company), PARC—Palo Alto Research Center
* Parallel ATA, PATA—Parallel ATA
* Portable Batch System, PBS—Portable Batch System
* Personal computer, PC—Personal Computer
* Printed circuit board, PCB—Printed Circuit Board
* Process control block, PCB—Process Control Block
* IBM PC DOS, PC DOS—Personal Computer Disc Operating System
* Peripheral Component Interconnect, PCI—Peripheral Component Interconnect
* PCI Express, PCIe—PCI Express
* PCI Extended, PCI-X—PCI Extended
* Printer Command Language, PCL—Printer Command Language
* Personal Computer Memory Card International Association, PCMCIA—Personal Computer Memory Card International Association
* Pulse-code modulation, PCM—Pulse-Code Modulation
* Perl Compatible Regular Expressions, PCRE—Perl Compatible Regular Expressions
* Public domain, PD—Public Domain
* Personal digital assistant, PDA—Personal Digital Assistant
* Portable Document Format, PDF—Portable Document Format
* Plesiochronous Digital Hierarchy, PDH—Plesiochronous Digital Hierarchy
* Programmed Data Processor, PDP—Programmed Data Processor
* Logical volume management, PE—Physical Extents
* Perl, PERL—Practical Extraction and Reporting Language
* Please Find Atachment, PFA—Please Find Attachment
* Peripheral Gateway, PG—Peripheral Gateway
* Pin grid array, PGA—Pin Grid Array
* Field-programmable gate array, PGA—Programmable Gate Array
* Profile-guided optimization, PGO—Profile-Guided Optimization
* Pretty Good Privacy, PGP—Pretty Good Privacy
* PHP—Hypertext Preprocessor
* PIC microcontroller, PIC—Peripheral Interface Controller
* Programmable Interrupt Controller, PIC—Programmable Interrupt Controller
* PID controller, PID—Proportional-Integral-Derivative
* Process identifier, PID—Process ID
* Personal information manager, PIM—Personal Information Manager
* Pine (e-mail client), PINE—Program for Internet News and Email
* Platform Independent Model, PIM—Platform Independent Model
* Packet Internet Gopher, PING—Packet Internet Gopher
* Programmed input/output, PIO—Programmed Input/Output
* PKCS—Public Key Cryptography Standards
* Public key infrastructure, PKI—Public Key Infrastructure
* Power line communication, PLC—Power Line Communication
* Programmable logic controller, PLC—Programmable Logic Controller
* Programmable logic device, PLD—Programmable Logic Device
* PL/I—Programming Language One
* PL/M—Programming Language for Microcomputers
* PL/P—Programming Language for Prime
* Power line communication, PLT—Power Line Telecommunications
* Power-on self-test, PMM—POST Memory Manager
* Portable Network Graphics, PNG—Portable Network Graphics
* Plug and play, PnP—Plug-and-Play
* Peer Name Resolution Protocol, PNRP—Peer Name Resolution Protocol
* Power over Ethernet, PoE—Power over Ethernet
* Point of Sale, PoS—Point of Sale
* Plain Old Class Object, POCO—Plain Old Class Object
* Persistent Object Identifier, POID—Persistent Object Identifier
* Plain Old Java Object, POJO—Plain Old Java Object
* Point of presence, POP—Point of Presence
* Post Office Protocol, POP3—Post Office Protocol v3
* POSIX—Portable Operating System Interface, formerly IEEE-IX
* Power-on self-test, POST—Power-On Self Test
* PowerPC, PPC—PowerPC
* Pixels per inch, PPI—Pixels Per Inch
* Pages Per Minute, PPM—Pages Per Minute
* Point-to-Point Protocol, PPP—Point-to-Point Protocol
* Point-to-Point Protocol over ATM, PPPoA—PPP over ATM
* Point-to-Point Protocol over Ethernet, PPPoE—PPP over Ethernet
* Point-to-point tunneling protocol, PPTP—Point-to-Point Tunneling Protocol
* Pull request, PR—Pull Request
* Programmable ROM, PROM—Programmable Read-Only Memory
* PostScript, PS—PostScript
* IBM Personal System/2, PS/2—Personal System/2
* Professional Services Automation, PSA—Professional Services Automation
* Platform Specific Model, PSM—Platform Specific Model
* Public Switched Telephone Network, PSTN—Public Switched Telephone Network
* Power supply, PSU—Power Supply Unit
* PSVI—Post-Schema-Validation Infoset
* PTS-DOS—PhysTechSoft – Disk Operating System
* Logical volume management, PV—Physical Volume
* Logical volume management, PVG—Physical Volume Group
* Personal video recorder, PVR—Personal Video Recorder
* Preboot Execution Environment, PXE—Preboot Execution Environment
* PCI eXtensions for Instrumentation, PXI—PCI eXtensions for Instrumentation
* Procedure Remote Call, PRC—Procedure Remote Call

Q

* Quad Data Rate SRAM, QDR—Quad Data Rate
* Quality control, QA—Quality Assurance
* Quad Flat Package, QFP—Quad Flat Package
* Quality of service, QoS—Quality of Service
* QOTD—Quote of the Day
* Qt (toolkit), Qt—Quasar Toolkit
* Queued teleprocessing access method, QTAM—Queued Teleprocessing Access Method
* Quarter Small Outline Package, QSOP—Quarter Small Outline Package
* Quality Windows Audio/Video Experience, qWave—Quality Windows Audio/Video Experience

R

* RACF—Resource Access Control Facility
* Rapid application development, RAD—Rapid Application Development
* RADIUS—Remote Authentication Dial In User Service
* RAID—Redundant Array of Independent Disks
* Resource Acquisition Is Initialization, RAII—Resource Acquisition Is Initialization
* RAID, RAIT—Redundant Array of Inexpensive Tapes
* Random-access memory, RAM—Random-Access Memory
* Reverse Address Resolution Protocol, RARP—Reverse Address Resolution Protocol
* Reliability, availability and serviceability (computer hardware), RAS—Reliability, Availability and Serviceability
* remote access service, RAS—Remote access service
* DVD region code, RC—Region Code
* Release Candidate, RC—Release Candidate
* Run commands, RC—Run Commands
* Root Cause Analysis, RCA—Root Cause Analysis
* Revision Control System, RCS—Revision Control System
* Remote desktop software, RD—Remote Desktop
* remove directory, rd—remove directory
* Relational database management system, RDBMS—Relational Database Management System
* Remote Desktop Connection, RDC—Remote Desktop Connection
* Resource Description Framework, RDF—Resource Description Framework
* Relational data model, RDM—Relational Data Model
* RTOS, RDOS—Real-time Disk Operating System
* Remote Desktop Protocol, RDP—Remote Desktop Protocol
* Remote Data Services, RDS—Remote Data Services
* Refal, REFAL—Recursive Functions Algorithmic Language
* REP—RAID Error Propagation
* Representational State Transfer, REST—Representational State Transfer
* RESV—Reservation Message
* Regular expression, regex—Regular Expression
* Regular expression, regexp—Regular Expression
* Radio frequency, RF—Radio Frequency
* Request for Comments, RFC—Request For Comments
* Radio frequency interference, RFI—Radio Frequency Interference
* Radio-frequency identification, RFID—Radio Frequency Identification
* RGB color model, RGB—Red, Green, Blue
* RGBA—Red, Green, Blue, Alpha
* Red Hat Linux, RHL—Red Hat Linux
* Red Hat Enterprise Linux, RHEL—Red Hat Enterprise Linux
* Rich Internet application, RIA—Rich Internet Application
* Recording Industry Association of America, RIAA—Recording Industry Association of America
* Raster image processor, RIP—Raster Image Processor
* Routing Information Protocol, RIP—Routing Information Protocol
* Regional Internet registry, RIR—Regional Internet registry
* Reduced instruction set computer, RISC—Reduced Instruction Set Computer
* RISC OS—Reduced Instruction Set Computer Operating System
* Remote job entry, RJE—Remote Job Entry
* Run-length encoding, RLE—Run-Length Encoding
* Run-length limited, RLL—Run-Length Limited
* rmdir—remove directory
* Java remote method invocation, RMI—Remote Method Invocation
* Richard Stallman, RMS—Richard Matthew Stallman
* Read-only memory, ROM—Read-Only Memory
* S-LINK, ROMB—Read-Out Motherboard
* ROM-DOS—Read-Only Memory - Disk Operating System
* Robotic Process Automation, RPA—Robotic Process Automation
* Remote procedure call, RPC—Remote Procedure Call
* IBM RPG, RPG—Report Program Generator
* RPM Package Manager, RPM—RPM Package Manager
* Routing and Remote Access Service, RRAS—Routing and Remote Access Service
* RSA (algorithm), RSA—Rivest Shamir Adleman
* Repetitive strain injury, RSI—Repetitive Strain Injury
* Radio Service Software, RSS—Radio Service Software
* RSS—Rich Site Summary, RDF Site Summary, or Really Simple Syndication
* RSVP—Resource Reservation Protocol
* RTAI—Real-Time Application Interface
* Real-time clock, RTC—Real-Time Clock
* Real-time business intelligence, RTE—Real-Time Enterprise
* RTEMS—Real-Time Executive for Multiprocessor Systems
* Rich Text Format, RTF—Rich Text Format
* Bi-directional text, RTL—Right-to-Left
* Real-time messaging protocol, RTMP—Real Time Messaging Protocol
* Real-time operating system, RTOS—Real-Time Operating System
* Real-time Transport Protocol, RTP—Real-time Transport Protocol
* Flow control (data), RTS—Ready To Send
* Real Time Streaming Protocol, RTSP—Real Time Streaming Protocol
* Run-time type information, RTTI—Run-time Type Information
* Remote terminal unit, RTU—Remote Terminal Unit
* Responsive Web Design, RWD—Responsive Web Design

S

* Software as a service, SaaS—Software as a Service
* Sass (stylesheet language), SASS—Syntatically Awesome Style Sheets
* Security Account Manager, SAM—Security Account Manager
* Storage area network, SAN—Storage Area Network
* Serial attached SCSI, SAS—Serial attached SCSI
* Serial ATA, SATA—Serial ATA
* Simple API for XML, SAX—Simple API for XML
* Spinning beachball of death, SBOD—Spinning Beachball of Death
* Serial Bus Protocol 2, SBP-2—Serial Bus Protocol 2
* sbin—superuser binary
* Windows Small Business Server, sbs—Small Business Server
* Standard Build Unit, SBU—Standard Build Unit
* SCADA—Supervisory Control And Data Acquisition
* Source Code in Database, SCID—Source Code in Database
* Software configuration management, SCM—Software Configuration Management
* Revision control, SCM—Source Code Management
* Secure copy, SCP—Secure Copy
* Single channel per carrier, SCPC—Single Channel Per Carrier
* Standard Commands for Programmable Instruments, SCPI—Standard Commands for Programmable Instrumentation
* Secure Content Storage Association, SCSA—Secure Content Storage Association
* SCSI—Small Computer System Interface
* Stream Control Transmission Protocol, SCTP—Stream Control Transmission Protocol
* Secure Digital, SD—Secure Digital
* SDDL—Security Descriptor Definition Language
* Synchronous Digital Hierarchy, SDH—Synchronous Digital Hierarchy
* Single-document interface, SDI—Single-Document Interface
* Single Edge Contact, SEC—Single Edge Contact
* Secure Digital, SDIO—Secure Digital Input Output
* Software development kit, SDK—Software Development Kit
* Simple DirectMedia Layer, SDL—Simple DirectMedia Layer
* Service Delivery, SDN—Service Delivery Network
* Session Description Protocol, SDP—Session Description Protocol
* Software-defined radio, SDR—Software-Defined Radio
* Synchronous dynamic random access memory, SDRAM—Synchronous Dynamic Random Access Memory
* Symmetric digital subscriber line, SDSL—Symmetric DSL
* Single-ended signalling, SE—Single Ended
* Software Engineering Institute, SEI—Software Engineering Institute
* Search engine optimization, SEO—Search Engine Optimization
* FTP over SSH, SFTP—Secure FTP
* Simple File Transfer Protocol, SFTP—Simple File Transfer Protocol
* SSH file transfer protocol, SFTP—SSH File Transfer Protocol
* Silicon Graphics, SGI—Silicon Graphics, Incorporated
* Standard Generalized Markup Language, SGML—Standard Generalized Markup Language
* ANSI escape code#SGR (Select Graphic Rendition) parameters, SGR—Select Graphic Rendition
* Secure Hash Algorithm, SHA—Secure Hash Algorithm
* Single-pair high-speed digital subscriber line, SHDSL—Single-pair High-speed Digital Subscriber Line
* Security information and event management, SIEM—Security information and event management
* SIGCAT—Special Interest Group on CD-ROM Applications and Technology
* SIGGRAPH—Special Interest Group on Graphics
* Single instruction, multiple data, SIMD—Single Instruction, Multiple Data
* SIM card, SIM—Subscriber Identification Module
* SIMM—Single Inline Memory Module
* Session Initiation Protocol, SIP—Session Initiation Protocol
* Supplementary Ideographic Plane, SIP—Supplementary Ideographic Plane
* Single instruction, single data, SISD—Single Instruction, Single Data
* Single-Input and Single-Output, SISO—Single-Input and Single-Output
* Service Level Agreement, SLA—Service Level Agreement
* SUSE Linux Enterprise Desktop, SLED—SUSE Linux Enterprise Desktop
* SUSE Linux Enterprise Server, SLES—SUSE Linux Enterprise Server
* Scalable Link Interface, SLI—Scalable Link Interface
* Serial Line Internet Protocol, SLIP—Serial Line Internet Protocol
* Service Level Management, SLM—Service Level Management
* Source lines of code, SLOC—Source Lines of Code
* Subject-matter expert, SME—Subject Matter Expert
* Single-mode optical fiber, SMF—Single-Mode (optical) Fiber
* Software project management, SPM—Software project management
* SPMD—Single Program, Multiple Data
* Single_point_of_failure, SPOF—Single point of failure
* SMA connector, SMA—SubMiniature version A
* Server Message Block, SMB—Server Message Block
* System Management BIOS, SMBIOS—System Management BIOS
* Synchronized Multimedia Integration Language, SMIL—Synchronized Multimedia Integration Language
* S/MIME—Secure/Multipurpose Internet Mail Extensions
* Supplementary Multilingual Plane, SMP—Supplementary Multilingual Plane
* Symmetric multiprocessing, SMP—Symmetric Multi-Processing
* Switched-mode power supply, SMPS—Switch Mode Power Supply
* SMS—Short Message Service
* System Management Server, SMS—System Management Server
* Simultaneous multithreading, SMT—Simultaneous Multithreading
* Simple Mail Transfer Protocol, SMTP—Simple Mail Transfer Protocol
* Systems Network Architecture, SNA—Systems Network Architecture
* Simple Network Management Protocol, SNMP—Simple Network Management Protocol
* SNTP—Simple Network Time Protocol
* Service-oriented architecture, SOA—Service-Oriented Architecture
* SOAP—Simple Object Access Protocol
* Symbolic Optimal Assembly Program, SOAP—Symbolic Optimal Assembly Program
* Stop Online Piracy Act, SOPA—Stop Online Piracy Act
* System-on-a-chip, SoC—System-on-a-Chip
* SO-DIMM—Small Outline DIMM
* Standard Operating Environment, SOE—Standard Operating Environment
* Small office/home office, SOHO—Small Office/Home Office
* Silicon on insulator, SOI—Silicon On Insulator
* Service pack, SP—Service Pack
* Single-page application, SPA—Single Page Application
* Sender Policy Framework, SPF—Sender Policy Framework
* Serial Peripheral Interface Bus, SPI—Serial Peripheral Interface
* Stateful Packet Inspection, SPI—Stateful Packet Inspection
* SPARC—Scalable Processor Architecture
* SQL—Structured Query Language
* Static random access memory, SRAM—Static Random Access Memory
* Static single assignment form, SSA—Static Single Assignment
* V-Model (software development), SSD—Software Specification Document
* Solid-state drive, SSD—Solid-State Drive
* Simple Service Discovery Protocol, SSDP—Simple Service Discovery Protocol
* Streaming SIMD Extensions, SSE—Streaming SIMD Extensions
* Secure Shell, SSH—Secure Shell
* Server Side Includes, SSI—Server Side Includes
* Single-system image, SSI—Single-System Image
* Small Scale Integration, SSI—Small-Scale Integration
* Service set (802.11 network), SSID—Service Set Identifier
* Secure Sockets Layer, SSL—Secure Socket Layer
* Single Sign On, SSO—Single Sign On
* Supplementary Special-purpose Plane, SSP—Supplementary Special-purpose Plane
* Streaming SIMD Extensions, SSSE—Supplementary Streaming SIMD Extensions
* Shortest Path Problem #Single-source shortest paths, SSSP—Single Source Shortest Path
* Secure Socket Tunneling Protocol, SSTP—Secure Socket Tunneling Protocol
* su (Unix), su—superuser
* Single UNIX Specification, SUS—Single UNIX Specification
* SUSE Linux, SUSE—Software und System-Entwicklung
* Scalable Video Coding, SVC—Scalable Video Coding
* Scalable Vector Graphics, SVG—Scalable Vector Graphics
* Super Video Graphics Array, SVGA—Super Video Graphics Array
* Structured VLSI design, SVD—Structured VLSI Design
* Adobe Flash, SWF—Shock Wave Flash
* Standard Widget Toolkit, SWT—Standard Widget Toolkit
* Sysop—System operator
* SOLID—Single-responsibility Principle, Open-closed Principle, Liskov substitution principle, Interface segregation principle, Dependency Inversion principle

T

* Optical disc recording modes, TAO—Track-At-Once
* Telephony Application Programming Interface, TAPI—Telephony Application Programming Interface
* Turbo Assembler, TASM—Turbo ASseMbler
* Terabyte, TB—TeraByte
* Tcl—Tool Command Language
* Transmission Control Protocol, TCP—Transmission Control Protocol
* Internet Protocol Suite, TCP/IP—Transmission Control Protocol/Internet Protocol
* Telecommunication Control Unit, TCU—Telecommunication Control Unit
* Time-division multiple access, TDMA—Time-Division Multiple Access
* Thin-film transistor, TFT—Thin-Film Transistor
* TFTP—Trivial File Transfer Protocol
* Texas Instruments, TI—Texas Instruments
* TIFF—Tagged Image File Format
* Three-letter acronym, TLA—Three-Letter Acronym
* Top-level domain, TLD—Top-Level Domain
* Thread-local storage, TLS—Thread-Local Storage
* Transport Layer Security, TLS—Transport Layer Security
* Type–length–value, TLV—Type—length—value
* /var/run, tmp—temporary
* Terminal node controller, TNC—Terminal Node Controller
* TNC connector, TNC—Threaded Neill-Concelman connector
* Transaction Processing Facility, TPF—Transaction Processing Facility
* Trusted Platform Module, TPM—Trusted Platform Module
* TRON command, TROFF—Trace Off
* TRON command, TRON—Trace On
* TRON Project, TRON—The Real-time Operating system Nucleus
* TRSDOS—Tandy Radio Shack - Disk Operating System
* Time Sharing Option, TSO—Time Sharing Option
* Travelling salesman problem, TSP—Traveling Salesman Problem
* Terminate-and-stay-resident program, TSR—Terminate and Stay Resident
* TTA (codec), TTA—True Tap Audio
* TrueType, TTF—TrueType Font
* Transistor–transistor logic, TTL—Transistor—Transistor Logic
* Time to live, TTL—Time To Live
* Speech synthesis, TTS—Text-to-Speech
* Computer terminal, TTY—Teletype
* Tucows, TUCOWS—The Ultimate Collection of Winsock Software
* TeX Users Group#Community, TUG—TeX Users Group
* TWAIN—Technology Without An Interesting Name

U

* UAAG—User Agent Accessibility Guidelines
* User Account Control, UAC—User Account Control
* Universal asynchronous receiver/transmitter, UART—Universal Asynchronous Receiver/Transmitter
* User Acceptance Testing, UAT—User Acceptance Testing
* Undefined behavior, UB—Undefined Behavior
* Universal Character Set, UCS—Universal Character Set
* Universal Description Discovery and Integration, UDDI—Universal Description, Discovery, and Integration
* UDMA—Ultra DMA
* User Datagram Protocol, UDP—User Datagram Protocol
* UEFI—Unified Extensible Firmware Interface
* Ultra high frequency, UHF—Ultra High Frequency
* User interface, UI—User Interface
* Upload, UL—Upload
* Gate array, ULA—Uncommitted Logic Array
* Ultra Large Scale Integration, ULSI—Ultra Large Scale Integration
* Upper memory area, UMA—Upper Memory Area
* Upper memory area, UMB—Upper Memory Block
* Unified Modeling Language, UML—Unified Modeling Language
* User-mode Linux, UML—User-Mode Linux
* Ultra-Mobile PC, UMPC—Ultra-Mobile Personal Computer
* Universal Mobile Telecommunications System , UMTS—Universal Mobile Telecommunications System
* Universal Naming Convention, UNC—Universal Naming Convention
* UNIVAC—Universal Automatic Computer (By MKS)
* Uninterruptible power supply, UPS—Uninterruptible Power Supply or Uninterrupted Power Supply
* Uniform Resource Identifier, URI—Uniform Resource Identifier
* Uniform Resource Locator, URL—Uniform Resource Locator
* Uniform Resource Name, URN—Uniform Resource Name
* Universal Serial Bus, USB—Universal Serial Bus
* :/usr, usr—User System Resources
* U.S. Robotics, USR—U.S. Robotics
* Coordinated Universal Time, UTC—Coordinated Universal Time
* Unicode, UTF—Unicode Transformation Format
* Unshielded twisted pair, UTP—Unshielded Twisted Pair
* UMTS Terrestrial Radio Access Network, UTRAN—Universal Terrestrial Radio Access Network
* UUCP—Unix to Unix Copy
* Universally Unique Identifier, UUID—Universally Unique Identifier
* Universal User Name, UUN—Universal User Name
* Universal Virtual Computer, UVC—Universal Virtual Computer
* Universal Windows Platform, UWP—Universal Windows Platform
* User experience design, UX—User Experience

V

* Filesystem Hierarchy Standard, var—variable
* VoLTE—Voice Over Long Term Evolution
* VAX—Virtual Address eXtension
* DOS Protected Mode Interface, VCPI—Virtual Control Program Interface
* Visual Basic, VB—Visual Basic
* Visual Basic for Applications, VBA—Visual Basic for Applications
* VBScript, VBS—Visual Basic Script
* Desktop virtualization, VDI—Virtual Desktop Infrastructure
* Visual Display Unit, VDU—Visual Display Unit
* Virtual DOS machine, VDM—Virtual DOS machine
* Very high bitrate digital subscriber line, VDSL—Very High Bitrate Digital Subscriber Line
* VESA—Video Electronics Standards Association
* File Allocation Table, VFAT—Virtual FAT
* Virtual Hard Disk, VHD—Virtual Hard Disk
* Virtual file system, VFS—Virtual File System
* Logical volume management, VG—Volume Group
* Video Graphics Array, VGA—Video Graphics Array
* Very high frequency, VHF—Very High Frequency
* Vital Information Resource Under Seize, VIRUS—Vital Information Resource Under Seize
* VLAN—Virtual Local Area Network
* VLSM—Variable Length Subnet Mask
* VESA Local Bus, VLB—Vesa Local Bus
* Very low frequency, VLF—Very Low Frequency
* Very long instruction word, VLIW—Very Long Instruction Word
* Very-large-scale integration, VLSI—Very-Large-Scale Integration
* Virtual machine, VM—Virtual Machine
* Virtual memory, VM—Virtual Memory
* Hypervisor, VMM—Virtual Machine Monitor
* VNC—Virtual Network Computing
* Video on demand, VOD—Video On Demand
* Voice over Internet Protocol, VoIP—Voice over Internet Protocol
* Virtual private network, VPN—Virtual Private Network
* Virtual private server, VPS—Virtual Private Server
* Graphics processing unit, VPU—Visual Processing Unit
* Virtual reality, VR—Virtual Reality
* VRML—Virtual Reality Modeling Language
* Virtual storage access method, VSAM—Virtual Storage Access Method
* Very small aperture terminal, VSAT—Very Small Aperture Terminal
* VT100, VT—Video Terminal
* Virtual Tape Library, VTL—Virtual Tape Library
* Virtual telecommunications access method, VTAM—Virtual Telecommunications Access Method
* Video Random Access Memory, VRAM—Video Random Access Memory

W

* World Wide Web Consortium, W3C—World Wide Web Consortium
* Apple Worldwide Developers Conference, WWDC—Apple Inc., Apple World Wide Developer Conference
* Wide area file services, WAFS—Wide Area File Services
* Web Accessibility Initiative, WAI—Web Accessibility Initiative
* Wide area information server, WAIS—Wide Area Information Server
* Wide area network, WAN—Wide Area Network
* Wireless access point, WAP—Wireless Access Point
* Wireless Application Protocol, WAP—Wireless Application Protocol
* Open Watcom Assembler, WASM—Watcom ASseMbler
* Web-Based Enterprise Management, WBEM—Web-Based Enterprise Management
* Web Content Accessibility Guidelines, WCAG—Web Content Accessibility Guidelines
* Windows Communication Foundation, WCF—Windows Communication Foundation
* Wavelength-division multiplexing, WDM—Wavelength-Division Multiplexing
* WebDAV—WWW Distributed Authoring and Versioning
* Wired Equivalent Privacy, WEP—Wired Equivalent Privacy
* Interrupt, WFI—Wait For Interrupt
* Wireless Fidelity, Wi-Fi—Wireless Fidelity
* WiMAX—Worldwide Interoperability for Microwave Access
* WinFS—Windows Future Storage
* Windows RunTime, WinRT—Windows RunTime
* Windows Internet Name Service, WINS—Windows Internet Name Service
* Wireless LAN, WLAN—Wireless Local Area Network
* Windows Media Audio, WMA—Windows Media Audio
* Windows Management Instrumentation, WMI—Windows Management Instrumentation
* Windows Media Video, WMV—Windows Media Video
* Windows Push Notification Service, WNS—Windows Push Notification Service
* Wake-on-LAN, WOL—Wake-on-LAN
* Wake-on-ring, WOR—Wake-on-Ring
* Write once, run anywhere, WORA—Write once, run anywhere
* Write once, run anywhere, WORE—Write once, run everywhere
* Write Once Read Many, WORM—Write Once Read Many
* Wi-Fi Protected Access, WPA—Wi-Fi Protected Access
* Web Proxy Autodiscovery Protocol, WPAD—Web Proxy Autodiscovery Protocol
* Personal area network, WPAN—Wireless Personal Area Network
* Windows Presentation Foundation, WPF—Windows Presentation Foundation
* WS-Discovery, WS-D—Web Services-Discovery
* Web Services Description Language, WSDL—Web Services Description Language
* Web Services Flow Language, WSFL—Web Services Flow Language
* Wireless USB, WUSB—Wireless Universal Serial Bus
* Wireless Wide Area Network, WWAN—Wireless Wide Area Network
* World Wide Name, WWID—World Wide Identifier
* World Wide Name, WWN—World Wide Name
* World Wide Web, WWW—World Wide Web
* WYSIWYG—What You See Is What You Get
* Wireless Zero Configuration, WZC—Wireless Zero Configuration

X

* XML Accessibility Guidelines, XAG—XML Accessibility Guidelines
* Extensible Application Markup Language, XAML—eXtensible Application Markup Language
* XDM (display manager), XDM—X Window Display Manager
* X display manager, XDMCP—X Display Manager Control Protocol
* XCBL—XML Common Business Library
* XHTML—eXtensible Hypertext Markup Language
* Xilp (Unix software), XILP—X Interactive ListProc
* XML—eXtensible Markup Language
* XMMS—X Multimedia System
* Extensible Messaging and Presence Protocol, XMPP—eXtensible Messaging and Presence Protocol
* Extended memory, XMS—Extended Memory Specification
* Xerox Network Systems, XNS—Xerox Network Systems
* Cross-platform, XP—Cross-Platform
* Extreme Programming, XP—Extreme Programming
* XPCOM—Cross Platform Component Object Model
* XPInstall, XPI—XPInstall
* Interface description language, XPIDL—Cross-Platform IDL
* Open XML Paper Specification, XPS—XML Paper Specification
* XML Schema (W3C), XSD—XML Schema Definition
* Extensible Stylesheet Language, XSL—eXtensible Stylesheet Language
* XSL Formatting Objects, XSL-FO—eXtensible Stylesheet Language Formatting Objects
* XSL Transformations, XSLT—eXtensible Stylesheet Language Transformations
* Cross-site scripting, XSS—Cross-Site Scripting
* eXtensible Tag Framework, XTF—eXtensible Tag Framework
* eXtended Triton Format, XTF—eXtended Triton Format
* XUL—XML User Interface Language
* XVGA—Extended Video Graphics Adapter

Y

* Year 2000 problem, Y2K—Year Two Thousand
* YAAF—Yet Another Application Framework
* Yacc, YACC—Yet Another Compiler Compiler
* You_aren't_gonna_need_it, YAGNI—You Aren't Gonna Need It
* YAML—YAML Ain't Markup Language
* YARN—Yet Another Resource Negotiator
* YaST—Yet another Setup Tool

Z

* Zone bit recording, ZCAV—Zone Constant Angular Velocity
* Zero code suppression, ZCS—Zero Code Suppression
* Zero insertion force, ZIF—Zero Insertion Force
* Zero insertion force, ZIFS—Zero Insertion Force Socket
* Zip (file format), ZIP—ZIP file archive
* Zero instruction set computer, ZISC—Zero Instruction Set Computer
* Zero One Infinity, ZOI—Zero One Infinity
* Zope, ZOPE—Z Object Publishing Environment
* Zone Multicast Address, ZMA—Zone Multicast Address
* ZPL (programming language), ZPL—Z-level Programming Language

See also

* Acronym
* Internet slang
* List of file formats
* List of information technology initialisms
* Professional certification

References

*

External links

The UNIX Acronym List

{{DEFAULTSORT:Computing And It Abbreviations
Lists of abbreviations
Lists of computer terms
Computer jargon