USIM - Universal Subscriber Identity Module
USISPA - United States Internet Service Provider Association
USITA - United States Independent Telephone Association
USL - UNIX Systems Laboratories
USM - UnSharp Masking
USM - User-based Security Model
USMT - User State Migration Tool
USMTF - United States Message Text Format
USN - Update Sequence Number
USOC - Universal Service Order Codes
USP - User Stack Pointer
USPARC - Ultra Scalable Processor Architecture Reduced instruction set Computer
USR - U.S. Robotics
USRT - Universal Synchronous Receiver/Transmitter
USS - UNIX® System Services
USSD - Unstructured Supplementary Service Data
USTA - United States Telephone Association
USV - Unified Security View
USWC - Uncached Speculative Write Combining
UT - Universal Time
UT - Upper Tester
UTF - UCS Transformation Format
UTF - UGAMP Transfer File
UTF - Unicode Transmission Format
UTI - Universal Text Interchange
UTL - User Trailer Label
UTLB - Unified Translation Look-aside Buffer
UTM - Universal Transaction Monitor
UTMS - Universal Mobile Telecommunications System
UTOPIA - Universal Test and Operations Physical layer Interface for ATM
UTP - Unshielded Twisted Pair
UTR - Universal Tone Receiver
UTRAN - UMTS Terrestrial Radio Access Network
UTS - Universal Timesharing System
UTS - University of Technology - Sydney
UTTC - Universal Tape-to-Tape Converter
UUCICO - UNIX-to-UNIX Copy Incoming Copy Outgoing
UUCP - UNIX-to-UNIX Copy Protocol
UUG - UNIX User Group
UUID - Universal Unique IDentifier
UUNET - UNIX-to-UNIX NETwork
UUT - Unit Under Test
UVL - User Volume Label
UVM - Universal Voice Module
UVM-C - Universal Voice Module - Channelized
UVM-U - Universal Voice Module - Unchannelized
UW - Ultra Wide
UWB - UltraWideBand
UWC - Universal Wireless Consortium
UWS - Universal Wireless Consortium
UXGA - Ultra eXtended Graphics Adapter