| PAC | Public Access Catalog. May be used interchangeably with the term OPAC; may also mean a catalog of library holdings which is not online
| - | Human Genome |
| OSLS | Open Source Library Software
| - | Human Genome |
| ISSN | International Standard Serials Number. A unique eight-digit number, in two groups of four, assigned to a periodical by the International Serials Data System.
| - | Human Genome |
| ISBN | International Standard Book Number
| - | Human Genome |
| iPod | A brand of portable media players designed and marketed by Apple, Inc.
| - | Human Genome |
| HIP | Horizon Internet Protocol; The V-Cat database on the Internet.
| - | Human Genome |
| BW | Digital bandwidth is a rate for data transfer
| - | Human Genome |
| WZ1 | World Zone 1
| - | Human Genome |
| WRED | weighted random early detection
| - | Human Genome |
| WPS | Wireless Priority Service
| - | Human Genome |
| WNCC | Wireless Network Control Center
| - | Human Genome |
| WMM | wireless fidelity multimedia
| - | Human Genome |
| WLSAS | Wireless Access Service
| - | Human Genome |
| WLSAA | wireless access arrangement
| - | Human Genome |
| WLNAS | Wireline Access Service
| - | Human Genome |
| WLNAA | wireline access arrangement
| - | Human Genome |
| WIPN | Wireless Private Network
| - | Human Genome |
| WISP | wireless Internet service provider
| - | Human Genome |
| WiFi | wireless fidelity
| - | Human Genome |
| WGI | within grade increase
| - | Human Genome |
| WFM | workforce management
| - | Human Genome |
| WEP(TWS) | wired equivalent privacy
| - | Human Genome |
| WDPDS | Wireless Digital Packet Data Service
| - | Human Genome |
| WCTP | wireless communications transfer protocol
| - | Human Genome |
| WACFO | where available commercially from offeror
| - | Human Genome |
| W-CDMA | wideband-code division multiple access
| - | Human Genome |
| VXML | voice eXtensible markup language
| - | Human Genome |
| VTU | Video Terminal Unit
| - | Human Genome |
| VTS | Video Teleconferencing Services
| - | Human Genome |
| VT1.5 | Virtual Tributary 1.5
| - | Human Genome |
| VT | virtual tributary
| - | Human Genome |
| VSS | Vulnerability Scanning Service
| - | Human Genome |
| VSR | very short reach
| - | Human Genome |
| VSAT | very small aperture terminal
| - | Human Genome |
| VS | Voice Services
| - | Human Genome |
| VRF | virtual routing and forwarding
| - | Human Genome |
| VPWS | Virtual Private Wire Service
| - | Human Genome |
| VPVN | virtual private voice network
| - | Human Genome |
| VPNMon | Virtual Private Network Monitoring
| - | Human Genome |
| VPLS | Virtual Private Local Area Network Service
| - | Human Genome |
| VPIM | voice profile for Internet mail
| - | Human Genome |
| VP/VC | virtual path/virtual channel
| - | Human Genome |
| VPAT | Voluntary Product Accessibility Template
| - | Human Genome |
| VoIPTS | Voice over Internet Protocol Transport Services
| - | Human Genome |
| VoFR | voice over frame relay
| - | Human Genome |
| VOD | video-on-demand
| - | Human Genome |
| VoATM | voice over asynchronous transfer mode
| - | Human Genome |
| VNS | Victim Notification System
| - | Human Genome |
| VLDB | very large database
| - | Human Genome |
| VIS | Voice Information System
| - | Human Genome |
| VIP | verification internet protocol
| - | Human Genome |
| VINES | Virtual Integrated Network Service
| - | Human Genome |
| VIF | vertical inlaid fiber
| - | Human Genome |
| VFRrt | variable frame rate-real time
| - | Human Genome |
| VFRnrt | variable frame rate-non real time
| - | Human Genome |
| VESDA | very early smoke detection apparatus
| - | Human Genome |
| VCO | voice carry over
| - | Human Genome |
| VCC | virtual channel connections
| - | Human Genome |
| VCAT | virtual concatenation
| - | Human Genome |
| VC | virtual circuit
| - | Human Genome |
| VBR-RT | variable bit rate-real time
| - | Human Genome |
| VBR-NRT | variable bit rate-non real time (also known as NRT-VBR)
| - | Human Genome |
| VBR | variable bit rate
| - | Human Genome |
| VAS | value added service
| - | Human Genome |
| V&H | vertical and horizontal coordinates
| - | Human Genome |
| UTC | universal time code
| - | Human Genome |
| USG | United States Government
| - | Human Genome |
| USNO | United States Naval Observatory
| - | Human Genome |
| USF | Universal Service Fund
| - | Human Genome |
| USC | United States Code
| - | Human Genome |
| US-CERT | United States-Computer Emergency Readiness Team
| - | Human Genome |
| UPSR | unidirectional path switch ring
| - | Human Genome |
| UNI | user-to-network interface
| - | Human Genome |
| UN | United Nations
| - | Human Genome |
| UMTS | Universal Mobile Telecommunications System
| - | Human Genome |
| UMS | Unified Messaging Services
| - | Human Genome |
| UM | unified messaging
| - | Human Genome |
| ULH | ultra longhaul
| - | Human Genome |
| UITN | Universal International Toll-Free Number
| - | Human Genome |
| UIFN | Universal International Free Phone Number
| - | Human Genome |
| UI | user interface
| - | Human Genome |
| UFR | unspecified frame relay
| - | Human Genome |
| UBS | unclassified but sensitive
| - | Human Genome |
| UBR | unspecified bit rate
| - | Human Genome |
| UBI | unique billing identifier
| - | Human Genome |
| TWS | Teleworking Services
| - | Human Genome |
| TUI | telephony user interface
| - | Human Genome |
| TTS | text to speech
| - | Human Genome |
| TTR | Time to Restore
| - | Human Genome |
| TSS | telecommunications service sector
| - | Human Genome |
| TSP | telecommunications service priority
| - | Human Genome |
| TSNOW | transport service now
| - | Human Genome |
| TSI | Time Slot Interchange
| - | Human Genome |
| TSG | timing signal generator
| - | Human Genome |
| TS/SCI | Top Secret/Sensitive Compartmented Information
| - | Human Genome |
| TSAA | terminating switched access arrangement
| - | Human Genome |
| TSA | Transportation Security Administration, Time Slot Alignment
| - | Human Genome |
| TS | Telecommunications Services, Trade Study
| - | Human Genome |
| TRM | Technical Reference Model
| - | Human Genome |
| TRACS | Total Router Access Configuration System
| - | Human Genome |
