List of acronyms: U

(Main list of acronyms)


 * U – (s) Uranium
 * U&E – Urea and electrolytes, see also Basic metabolic panel

UA

 * UA – (s) Ukraine (ISO 3166 digram) (i) Unit of Action
 * UAAP – (i) University Athletic Association of the Philippines
 * UAB
 * (i) Universitat Autònoma de Barcelona (Spanish for "Autonomous University of Barcelona")
 * (i) University of Alabama at Birmingham (cf. UAB Blazers, the university's athletic program)
 * (i) Upravlyayemaya aviatsionnaya bomba (Russian for "Guided aerial bomb")
 * UAE – (i/s) United Arab Emirates (also IOC and FIFA trigram, but not ISO 3166)
 * UAH
 * (s) Ukrainian hryvnia (ISO 4217 currency code)
 * (i) University of Alabama in Huntsville
 * UAR
 * (i) Uniformly At Random (probability)
 * Unión Argentina de Rugby (Spanish for "Argentine Rugby Union")
 * United Arab Republic
 * UAV – (i) Unmanned Aerial Vehicle

UB

 * UBA – Unbundled Bitstream Access
 * UBC
 * (i) United Baptist Church
 * University of British Columbia
 * UBE – (i) Uniform Bar Examination (US)
 * UBI – Universal basic income
 * UBIGEO – (i) Ubicación Geografica (Spanish for Geographical Location)
 * UBS – Union Bank of Switzerland

UC

 * UCAV – (a/i) Unmanned Combat Air Vehicle
 * UCBSA – (i) United Cricket Board of South Africa
 * UCF – (i) University of Central Florida (cf. UCF Knights, this school's athletic program)
 * UCI
 * (i) Union Cycliste Internationale (French, "International Cycling Union")
 * University of California, Irvine
 * UÇK – (i) initialism for two Albanian guerrilla movements
 * UCLA – (i) University of California, Los Angeles (cf. UCLA Bruins, this school's athletic program)
 * UCLES – (i) University of Cambridge Local Examinations Syndicate
 * UCR
 * (i) University of Costa Rica
 * University of California, Riverside
 * UCS – (i) Union of Concerned Scientists
 * UCSB – (i) University of California, Santa Barbara
 * UCSD – (i) University of California, San Diego

UD

 * UDAS – (a) Uppsala-DLR Asteroid Survey
 * UDDI – (a) Universal Description, Discovery and Integration
 * UDP – (i) User Datagram Protocol
 * UDT – (i) Underwater Demolition Team
 * UDTS – (i) Uppsala-DLR Trojan Survey

UE

 * UE – (i) Unit of Employment
 * UEFA – (a) Union of European Football Associations
 * UEFI - (i/a) Unified Extensible Firmware Interface
 * UESAC – (a) Uppsala-ESO Survey of Asteroids and Comets

UF

 * UFC – (i) Ultimate Fighting Championship
 * UFO
 * (i) Unidentified flying object
 * United Farmers of Ontario

UG

 * ug – (s) Uyghur language (ISO 639-1 code)
 * UG – (s) Uganda (ISO 3166 and FIPS 10-4 country code digram)
 * UGA – (s) Uganda (ISO 3166 trigram)
 * UGV – (i) Unmanned Ground Vehicle
 * UGX – (s) ugandan shilling (ISO 4217 currency code)

UH

 * UHF – (i) Ultra High Frequency
 * UHMW – (i) Ultra-high-molecular-weight polyethylene
 * UHRB – (i) Ultra-High Resolution Building (simulation)
 * UHNWIs - (i) Ultra High Net Worth Individuals Investopedia and Wikipedia

UI

 * UIC – (i) University of Illinois Chicago
 * UID – (i) User ID
 * uig – (s) Uyghur language (ISO 639-2 code)
 * UIL – (i) University Interscholastic League (governing body for most interscholastic activities, notably sports, in Texas public high schools)
 * UIUC – (i) University of Illinois Urbana-Champaign
 * UIW – (i) University of the Incarnate Word

UJ

 * UJTL – (i) Universal Joint Task List
 * UJT – Unijunction transistor

UK

 * uk – (s) Ukrainian language (ISO 639-1 code)
 * UK
 * (i) United Kingdom (also (s) FIPS 10-4 country code)
 * (i) University of Kentucky
 * UKDA – (i) United Kingdom Data Archive
 * UKIP - (a) UK Independence Party
 * ukr – (s) Ukrainian language (ISO 639-2 code)
 * UKR – (s) Ukraine (ISO 3166 trigram)

UL

 * UL – (i) Underwriters Laboratories
 * ULEB – (a) Union des ligues européens de basket-ball, French for "Union of European Basketball Leagues"
 * ULF – (i) Ultra Low Frequency
 * ULOF – unprotected loss of flow (nuclear accident)
 * ULOHS – unprotected loss of heat sink (nuclear accident)
 * UTOP – unprotected transient overpower (nuclear accident)

UM

 * UM – (s) United States Minor Outlying Islands (postal symbol; ISO 3166 digram)
 * UMA – (i) Upper Memory Area
 * UMB – (i) University of Maryland, Baltimore
 * UMBC – (i) University of Maryland, Baltimore County
 * UMC – (i) United Microelectronics Corporation – University of Missouri–Columbia
 * UMD – (i) University of Maryland, College Park
 * UMCP – (i) University of Maryland, College Park
 * UMES – (i) University of Maryland Eastern Shore
 * UMGC – (i) University of Maryland, Global Campus
 * UMI – (s) United States Minor Outlying Islands (ISO 3166 trigram)
 * UMIST – (a) University of Manchester Institute of Science and Technology
 * UMK – (i) Uniwersytet Mikołaja Kopernika (Polish "Nicolaus Copernicus University")
 * UML – (i) Unified Marxist-Leninist Communist Party of Nepal – Unified Modeling Language – University of Massachusetts Lowell – User-Mode Linux
 * UMNO – (a) United Malays National Organisation (Malaysia)
 * UMTS – (i) Universal Mobile Telecommunications System

UN

 * UN – (i) United Nations
 * UNABOM – (p) University and airline bomber (FBI case name)
 * UNAIDS – (i/a) Joint United Nations Programme on HIV/AIDS
 * UNaM – (p/a) Universidad Nacional de Misiones (Spanish, "National University of Misiones")
 * UNAM – (a) Universidad Nacional Autónoma de México (Spanish, "National Autonomous University of Mexico")
 * UNAMSIL – (p) United Nations Mission in Sierra Leone
 * UNCF – (i) United Negro College Fund
 * UNCLOS – (a) United Nations Convention on the Law of the Sea
 * UNCSGN – (i) United Nations Conference on the Standardization of Geographical Names
 * UNCTAD – (p) United Nations Conference on Trade and Development
 * UNDCP – (i) United Nations Drug Control Programme
 * UNDE – (i/a) Union of National Defence Employees (Canada)
 * UNDP – (i) United Nations Development Programme
 * UNEP – (a) United Nations Environment Programme
 * UNESCO – (a) United Nations Educational, Scientific and Cultural Organization
 * UNFCCC – (i) United Nations Framework Convention on Climate Change
 * UNFICYP – (p) United Nations Peacekeeping Force in Cyprus
 * UNGEGN – (i) United Nations Group of Experts on Geographical Names
 * UNHCR – (i) United Nations High Commissioner for Refugees
 * UNICEF – (a) United Nations Children's Fund (originally the United Nations International Children's Emergency Fund)
 * UNICRI – (p) United Nations Interregional Crime and Justice Research Institute
 * UNIDO – (a) United Nations Industrial Development Organization
 * UNIFEM – (p) United Nations Development Fund for Women (from the French Fonds de développement des Nations unies pour la femme)
 * UNIS – (p) University of Surrey
 * UNLV – (i) University of Nevada, Las Vegas
 * UNMIK – (p) United Nations Interim Administration Mission in Kosovo
 * UNMOVIC – (p) United Nations Monitoring, Verification and Inspection Commission
 * UNOSOM – (p) United Nations Operations in Somalia
 * UNPROFOR – (p) United Nations Protection Force (in former Yugoslavia)
 * UNRISD – (i) United Nations Research Institute for Social Development
 * UNSM – (i) Union of Nova Scotia Municipalities
 * UNTAC – (a) United Nations Transitional Authority in Cambodia
 * UNTAET – (i/a) United Nations Transitional Administration in East Timor
 * UNU – (i) United Nations University

UP

 * UP
 * (s) Ukraine (FIPS 10-4 country code)
 * Union Pacific Railroad (AAR reporting mark)
 * (i) Upper Peninsula (of Michigan)
 * Uttar Pradesh
 * UPC
 * (i) United Pentecostal Church
 * (i) Universal Product Code
 * UPDA – Uganda People's Democratic Army
 * UPdM – (i) Università Popolare della Multimedialità
 * UPDM – Unified Profile for DoDAF/MODAF
 * Unified Modeling Language Profile for DoDAF and MoDAF
 * Unité de psychiatrie du développement mental
 * Universal Pattern Decomposition Method
 * Unix Power Device Management
 * Unpressurized Docking Mast
 * Urban Planning, Design and Management
 * UPF – (i) Universitat Pompeu Fabra (Catalan, "Pompeu Fabra University")
 * UPI – (i) United Press International
 * UPN – (i) United Paramount Network
 * UPS
 * (i) Uninterruptible Power Supply
 * United Parcel Service
 * UPT – Universal Personal Telecommunications
 * UPTN – Upper Peninsula Telehealth Network
 * UPU – (i) Universal Postal Union

UR

 * ur – (s) Urdu language (ISO 639-1 code)
 * UR – (s) Soviet Union (NATO country code, obsolete 1992)
 * URBSFA – (i) Union royale belge des sociétés de football association (French for Royal Belgian Football Association)
 * URC
 * (i) Uganda Railways Corporation
 * United Rugby Championship
 * Utility regulatory commission
 * urd – (s) Urdu language (ISO 639-2 code)
 * URD – (i) User requirements document
 * URI
 * (i) Uniform Resource Identifier
 * University of Rhode Island
 * URL – (a/i) Uniform Resource Locator ("earl")
 * URU – (s) Uruguay (IOC and FIFA trigram, but not ISO 3166)
 * URY – (s) Uruguay (ISO 3166 trigram)

US

 * US – (i) United States (also (s) ISO 3166 and FIPS 10-4 country code digram)
 * USA
 * (i) United States of America (also (s) ISO 3166 trigram)
 * United States Army
 * USAF – (i) United States Air Force
 * USAFSPC – (i) U.S. Air Force Space Command
 * USAACE – (p) United States Army Aviation Center of Excellence, Fort Rucker, Alabama
 * USAADAC – (i) United States Army Air Defense Artillery School, Fort Sill, Oklahoma
 * USAAS – (p) United States Army Armor School, Ft. Benning, Georgia
 * USAIC
 * (i) U.S. Army Infantry Center
 * U.S. Army Intelligence Center
 * USAID – (a/i) United States Agency for International Development
 * USAP
 * (a) Union Sportive des Arlequins Perpignanais
 * (i) United States Antarctic Program
 * USAPATRIOT – (i) Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism
 * USAREUR – (p) United States Army Europe
 * USB – (i) Universal Serial Bus
 * USC
 * (i) United States Code
 * University of South Carolina
 * University of Southern California
 * USCG – (i) United States Coast Guard
 * USCINCSPACE – (p) United States Commander in Chief, Space Command
 * USD
 * (s) United States dollar (ISO 4217 currency code)
 * USD(A&S) – (i) Under Secretary of Defense for Acquisition and Sustainment
 * ASD(R&E) Under Secretary of Defense for Research and Engineering
 * USD(C) – (i) (U.S.) Under Secretary of Defense (Comptroller)
 * USDA – (i) United States Department of Agriculture
 * USDI – (i) United States Department of the Interior
 * USDOE – (i) United States Department of Energy
 * USD(I) – Under Secretary of Defense for Intelligence
 * USDPR – (i) (U.S.) Under Secretary of Defense for Personnel and Readiness
 * USDP – (i) (U.S.) Under Secretary of Defense for Policy
 * USDRE – (i) (U.S.) Under Secretary of Defense for Research and Engineering
 * USEC – (a) United States Enrichment Corporation
 * USFL – (i) United States Football League, two different leagues of American football, one operating from 1983–1985 and the second having started play in 2022
 * USFWS – (i) United States Fish and Wildlife Service
 * USGS – (i) United States Geological Survey
 * USIA – (i) United States Information Agency
 * USJFCOM – (p) United States Joint Forces Command
 * USL
 * (i) United Soccer League (formerly United Soccer Leagues), a governing body for several lower-level leagues in the United States
 * United Soccer League, the former name of a league operated by the above organization that now plays at the second U.S. level as the USL Championship
 * United Soccer League, a completely different soccer league that operated in 1984 and 1985
 * University of Southwestern Louisiana, a former name for the school now known as the University of Louisiana at Lafayette
 * USLC – (i) USL Championship
 * USLS – (i) USL Super League (women's soccer league starting play in 2024)
 * USLW
 * (i) USL W-League, a women's soccer league operated by the United Soccer League organization from 1995 to 2015
 * USL W League, another women's league operated by the same organization that started play in 2022
 * USMC – (i) United States Marine Corps
 * USMLE – (i) United States Medical Licensing Examination
 * USMNT – (i) United States men's national (soccer) team
 * USN – (i) United States Navy
 * USNA – (i) United States National Arboretum – United States Naval Academy
 * USNB – (i) United States Naval Base
 * USNG – (i) United States National Grid
 * USNH – (i) United States Naval Hospital
 * USNI – (i) United States Naval Institute
 * USNO – (i) U.S. Naval Observatory
 * USNOFS – (i) United States Naval Observatory Flagstaff Station
 * USNP – (i) United States Newspaper Program
 * USNR – (i) United States Navy Reserve
 * USNS – (i) United States Naval Ship
 * USNY – (a) University of the State of New York (usually pronounced "use-knee")
 * USNZ – (i) University Sport New Zealand
 * USP – (i) Unique Selling Point
 * USPS – (i) United States Postal Service
 * USPTO – (i) United States Patent and Trademark Office
 * USR
 * (a) Universal System Resources (/usr, directory in a *NIX filesystem)
 * (s) User
 * USS – (i) United States ship (sometimes meaningless, see Star Trek)
 * USSPACECOM – (p) United States Space Command
 * USSR – (i) Union of Soviet Socialist Republics
 * UST – (i) Underground Storage Tank
 * USTRANSCOM – (p) United States Transportation Command
 * USWNT – (i) United States women's national (soccer) team

UT

 * UT – (i) Universal Time
 * UTEP – (a/i) University of Texas at El Paso (pronounced you-tep)
 * UTM – (i) Universal Transverse Mercator (geographical co-ordinate system)
 * UTRGV – (i) University of Texas Rio Grande Valley

UU

 * UU – (i) Unitarian Universalism – University of Utah – Unseen University
 * UUA – (i) Unitarian Universalist Association
 * UUID – (i) Universally Unique Identifier (see also GUID)
 * UUV – (i) Unmanned Underwater Vehicle

UV

 * UV – (s) Burkina Faso (FIPS 10-4 country code; from Upper Volta) – (p) ultraviolet
 * UVM
 * (i) Universal Verification Methodology
 * (i) Universidad del Valle de México
 * (i) University of Vermont, from its Latin name of Universitas Viridis Montis ("University of the Green Mountains")
 * (i) UV mapping

UW

 * UW – (i) University of Washington
 * UWO – (i) University of Western Ontario
 * UWW – (i) United World Wrestling

UX

 * UXO – (p) Unexploded ordnance

UY

 * UY – (s) Uruguay (ISO 3166 and FIPS 10-4 country code digram)--Up yours
 * UYU – (s) Uruguayan peso uruguayo (ISO 4217 currency code)

UZ

 * uz – (s) Uzbek language (ISO 639-1 code)
 * UZ – (s) Uzbekistan (ISO 3166 and FIPS 10-4 country code digram)
 * uzb – (s) Uzbek language (ISO 639-2 code)
 * UZB – (s) Uzbekistan (ISO 3166 trigram)
 * UZS – (s) Uzbek soum (ISO 4217 currency code)