@c Syntax:
@c ACRONYM
@c Expansion[ (Reference)][, "Style"]
@c Additional explanations are included in [square brackets]

@table @asis
@item UA
Unnumbered Acknowledgement

@item UA
User Agent (MHS, OSI)

@item UAA
UnternehmensAnwendungsArchitektur (IM)

@item UAB
Unix Appletalk Bridge (Apple, AppleTalk, Unix)

@item UAC
Universal Access Control (IBM)

@item UADPS
Uniform Automatic Data Processing System

@item UAE
Unknown / Unrecoverable Application Error (Windows)

@item UAF
User Authorization File

@item UAPDU
User Agent Protocol Data Unit (PDU)

@item UART
Universal Asynchronous Receive and Transmit

@item UAS
UnAvailable Seconds (DS1/E1, DS3/E3)

@item UBA
UniBus Adapter (DEC)

@item UBE
Unsolicited Bulk Email spam, Internet

@item UBNI
Ungermann-Bass Network Interface

@item UBR
Unspecified Bit Rate (ATM, CBR, VBR, ABR, QOS)

@item UCC
Uniform Commercial Code

@item UCE
Unsolicited Commercial E-mail Usenet, spam

@item UCI
User-Computer Interface

@item UCLA
University of California at Los Angeles org., USA

@item UCP
Universal Computer Protocol SMS, Europe

@item UCR
Under Color Removal (DTP)

@item UCS
Universal [multiple-octet] coded Character Set (ISO, IEC, DIS 10646)

@item UCS
Universal Classification System

@item UCSB
University of California at Santa Barbara org. USA

@item UCSD
University California San Diego org., USA

@item UDB
Universal DataBase [server] (IBM, DB)

@item UDC
Universal Decimal Classification

@item UDF
Universal Disc Format (CD, OSTA)

@item UDF
User Defined Function

@item UDK
UmweltDatenKatalog (NUIS-SH)

@item UDLI
??? [hardware description language] (HDL), "UDL/I"

@item UDMA
Ultra Direct Memory Access (DMA, ATA)

@item UDO
User Defined Objects

@item UDP
Usenet Death Penalty Usenet, spam

@item UDP
User Datagram Protocol (Internet, RFC 768)

@item UDPIP
User Datagram Protocol / Internet Protocol, "UDP/IP"

@item UDT
User-defined DataType (DB)

@item UDVM
Universal Data Voice Multiplexer

@item UEIDE
Ultra Enhanced Integrated Drive Electronics (IDE, HDD)

@item UEV
User End of Volume

@item UFS
Universal File System

@item UFS
Unix File System (Unix)

@item UFST
Universal Font Scaling Technology (Agfa)

@item UHC
United Hitech Corporation manufacturer, Taiwan

@item UHF
Ultra High Frequency

@item UHL
User Head Label

@item UI
Unix International manufacturer, Unix

@item UI
User Interface

@item UIC
User Identification Code

@item UID
Unit IDentifier cryptography, EES

@item UID
User IDentification

@item UIDL
Unique ID Listing (POP3, RFC 1939)

@item UIL
User Interface Language

@item UIMS
User Interface Management System

@item UIS
UmweltInformationsSystem

@item UISRM
User Interface System Reference Model

@item UKERNA
United Kingdom Education and Research Networking Association org., UK

@item ULA
Uncommitted Logic Array

@item ULANA
Unified Local Area Network Architecture

@item ULCC
University of London Computer Center org., UK

@item ULP
Upper Layer Protocols (FC)

@item ULSI
Ultra Large Scale Integration

@item UMA
Unified Memory Architecture

@item UMA
Universal Measurement Architecture (Unix, X/Open)

@item UMA
Upper Memory Area (Intel)

@item UMADS
Universal Measurement Architecture Data Storage (UMA)

@item UMB
Upper Memory Block (Intel, UMA)

@item UMC
United Microelectronics Corporation manufacturer

@item UME
UNI Management Entity (UNI, ILMI)

@item UML
Unified Method Language (CASE)

@item UML
Unified Modelling Language (OOP)

@item UMTS
Universal Mobile Telecommunications System (IN, Mobile Systems)

@item UNA
Universal Network Architecture

@item UNARP
UNsolicited Address Resolution Protocol (ARP, RFC 1868)

@item UNC
Universal Naming Convention (IBM, MS, Novell, LAN)

@item UNCID
UNiform rules of Conduct for Interchange of Trade data by teletransmission (EDIFACT)

@item UNCLE
Unix Net for Computer security in Law Enforcement org., USA, Unix, "U.N.C.L.E."

@item UNEDIFACT
United Nations EDIFACT (ISO 9735, EDIFACT), "UN/EDIFACT"

@item UNGTDI
United Nations Guidelines for Trade Data Interchange UN/EDIFACT, predecessor, "UN/GTDI"

@item UNI
Universal Network Interface (Cogent)

@item UNI
User Network Interface

@item UNIVAC
UNIVersal Automatic Computer

@item UNMA
Unified Network Management Architecture

@item UNSM
United Nations Standard Message, (UN/EDIFACT)

@item UNTDED
United Nations Trade Data Elements Directory (EDIFACT)

@item UNTDID
United Nations Trade Data Interchange Directory (EDIFACT)

@item UP
Uni Processor [system]

@item UPA
Ultra Port Architecture (Sun, SMP)

@item UPAM
User Primary Access Method (BS2000)

@item UPC
Universal Product Code (EAN)

@item UPC
Usage Parameter Control (UNI, ATM)

@item UPL
User Program Language

@item UPM
Umdrehungen Pro Minute (HDD)

@item UPM
User Profile Management (IBM)

@item UPN
Umgekehrte Polnische Notation

@item UPP
Universal Procedure Pointer (AE, Apple)

@item UPPS
Universal Portable Protocol Stack / Support (Schneider & Koch)

@item UPS
Uninterruptible Power Supply

@item UPS
Unix Print Services (Unix)

@item UPT
Universal Personal Telecommunications (IN)

@item UPT
Universelle Personengebundene Telekommunikation (IN)

@item URA
Uniform Resource Agent (WWW)

@item URC
Uniform Resource Citation (WWW)

@item URC
Uniform Resources Characteristics (URI, WWW)

@item URI
Uniform Resource Identifier (WWW, RFC 1630)

@item URL
Uniform Resource Locator (WWW, RFC 1738)

@item URN
Uniform Resource Name (WWW, RFC 1737)

@item URSN
Unique Resource Serial Number (URI, WWW)

@item US
Unit Separator (BTX, VPCE)

@item USA
United Software Association org., USA

@item USACNII
US Advisory Council on the National Information Infrastructure org., USA

@item USART
Universal Synchronous Asynchronous Receiver / Transmitter (IC)

@item USB
Universal Serial Bus (Intel)

@item USCP
Unicos Station Call Processor [protocol] (Cray, MPP)

@item USD
User's Supplementary Documents (BSD, Unix)

@item USDC
Universal Switched Data Capability

@item USDN
United States Digital Network

@item USEC
User-based SECurity [model] (SNMP)

@item USENET
USErs' NETwork (Internet)

@item USG
Unix Support Group org., Unix

@item USITA
United States Independent Telephone Association org., USA

@item USL
Unix Systems Laboratories (AT&T, Unix)

@item USMTF
United States Message Text Format (USA)

@item USP
User Stack Pointer

@item USR
U.S. Robotics manufacturer

@item USR
User Service Routines

@item USRT
Universal Synchronous Receiver/Transmitter (IC)

@item USTA
United States Telephone Association org., USA

@item USV
Unterbrechungsfreie Strom-Versorgung

@item USWC
Uncached Speculative Write Combining (CPU)

@item UT
Universal Time [+0000] (TZ, GMT)

@item UT
Upper Tester

@item UTC
Universal Time Coordinated (DCE)

@item UTC
Universal Time Coordinates [+0000] (TZ, GMT)

@item UTI
Universal Text Interchange

@item UTL
User Trailer Label

@item UTLB
Unified Translation Look-aside Buffer (CPU)

@item UTM
Universal Transaction Monitor

@item UTM
Universeller TransaktionsMonitor (BS2000, Sinix, TP)

@item UTOPIA
Universal Test & Operations Physical layer Interface for ATM (PL, ATM)

@item UTP
Unshielded Twisted Pair [cable] (TP)

@item UTS
Universal Timesharing System

@item UTTC
Universal Tape-To-Tape Converter

@item UUCICO
Unix to Unix Copy Incoming Copy Outgoing (Unix)

@item UUCP
Unix to Unix Copy Protocol (Unix)

@item UUG
Unix User Group org., Unix, User group

@item UUID
Universal Unique IDentifier

@item UUNET
Unix to Unix NETwork org., ISP

@item UUT
Unit-Under-Test

@item UVL
User Volume Label

@item UW
Ultra Wide [SCSI] (SCSI)

@end table