U.S.S.R.Union of Soviet Socialist Republics
U/LUpload, send to the BBS
UAE1. Unrecoverable Application Error (Bane of Windows users!).
2. Unix Ami.
UAIBUnion of Automobile Importers (Bulgaria)
UBAGerman Federal Environmental Agency
UBOAUnited Bus Owners of America
UCIAUniform Conviction Information Act
UCRAUniform Child Restraint Anchorage
UCSUniversal Character Set
UCTFUganda Charity Trust Fund
UFTAAUnited Federation of Travel Agents Associations
UIAVMMUnless I Am Very Much Mistaken
UITPInternational Union of Public Transport
UKASUnited Kingdom Accreditation Service
UKELAUK Environmental Law Association
UKETSUK Emissions Trading Scheme
UKPIAUK Petroleum Industry Association
UKRAUK Renderers Association
UKSAUnited Kingdom Steel Association
UKWUK Waste Management Ltd.
ULUrban Legend; UpLoad, send to BBS
ULCCCUltra Low Carbon Car Challenge
ULSABUltralight Steel Auto Body
ULSACUltralight Steel Auto Closures
ULSASUltralight Steel Auto Suspensions
ULSDUltra Low Sulphur Diesel
ULVZultra-low velocity zone
UMUnited States Minor Outlying Islands
UMCUnion Management Committee
UMTAUrban Mass Transportation Administration
UMTSUniversal Mobile Telecommunications System
UN-ECEUnited Nations Economic Commission For Europe
UN-JEDIUnited Nations Joint Electronic Data Interchange
UN/ECEWorld Forum for Harmonization of Vehicle RegulationS (WP.29)
UNATACUnion of Technical Assistance For Motor Vehicle and Road Traffic
UNCLEUnified Nuclear Coalition of Latvian Emigrants
Unconventional English pass.passive, -ly
UNFCCCUnited Nations Framework Convention on Climate Change
UNGASSUn General Assembly Special Session
UNICEUnion of Industrial & Employers Confederation of Europe
UNICEFUnited Nations International Childrens Emergency Fund
UNIMARCUniversal Machine-Readable Cataloging
Univ.(in titles) University
UNSAUitwisseling Nederland Suid Afrika
UNWTOUnited Nations World Tourism Organisation
UPDVSAssociation of Vehicle Manufacturers (Serbia)
URLUniform Resource Locator
URPAUltrasonic Rear Parking Assist
URTUUnited Road Transport Union
USAMPUnited States Automotive Materials Partnership
USCARUnited States Council For Automotive Research (Chrysler, Ford, GM CO-Operation)
USDOTUnited States Department of Transportation
USNC-CIEUnited States National Committee of the International Commission on Illumination
UTC1. Under The Counter.
2. Universal Time Coordinated (another name for GMT).
UTMCUrban Traffic Management and Control
UTRDeveloper unable to recreate.
UVNVMotor Vehicle Research Institute
UVWUnloaded Vehicle Weight
UWEDUse of Work Equipment Directive (89/655/EEC) [also see AUWED)