| Acronym | Sense | Language | Topics |
|---|---|---|---|
| TTP | Trends in Theoretical Physics | In English | → Serial publications, periodicals → Physics |
| TTRA | Travel and Tourism Research Association (www.ttra.com) | In English | → Associations → Tourism |
| TTSP | Transport Theory and Statistical Physics | In English | → Serial publications, periodicals → Physics |
| TTU | Timing Terminal Unit | In English | |
| TTVC | Test Termination and Verification Contractor | In English | |
| TTX | TinyOS Technology Exchange | In English | → Congresses → Operating systems → Electronics |
| TTY | Teletype | In English | → Telecommunications |
| TU | Technical Utilization | In English | → Engineering, technology |
| TU | Technology Utilization | In English | → Engineering, technology |
| TU | Transport Unit | In English | |
| TUAG | Telecommunication Users Advisory Group | In English | → Organizations and associations → Telecommunications |
| TUASB | Tokyo University Institute of Space and Aeronautical Science Bulletin | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → Astronautics |
| TUASR | Tokyo University Institute of Space and Aeronautical Science Report | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → Astronautics |
| TUC | Trades Union Congress | In English | → Organizations and associations → Labour, labour economics |
| TUCAA | The Ultimate Computer Acronyms Archive (www.acronyms.ch) | In English | → Encyclopaedias, reference works → Computer hardware |
| TUFEJ | Tokyo University Faculty of Engineering Journal Series | In English | → Serial publications, periodicals → Engineering, technology |
| TUFER | Tokyo Denki University Faculty of Engineering Research Reports | In English | → Serial publications, periodicals → Engineering, technology |
| TUFI | Toughened Unipiece Fibrous Insulation | In English | |
| TUISR | Tokyo University Institute Industrial Science Report | In English | → Serial publications, periodicals → Mathematics and natural sciences → Applied sciences, technology |
| TUNEL | Terminal deoxynucleotidyltransferase-mediated dUTP-biotin Nick End Labeling | In English | → Biochemistry, biophysics |
| TUSTEP | Tübingen System of TExt processing Programs | In English | |
| TV | Target Vehicle | In English | → Vehicle engineering |
| TV | Television | In English | → Telecommunications |
| TV | Thermal Vacuum | In English | |
| TV | Thrust Vector | In English | → Vehicle engineering |
| TV | Transport(er) Vehicle | In English | → Vehicle engineering |
| TVA | Temporary Variance Authority | In English | |
| TVA | Thrust Vector Alignment | In English | → Astronautics |
| TVAR | Test Variance | In English | → Quality management |
| TVC | Thermal Vacuum Chamber | In English | |
| TVC | Thrust Vector Control | In English | → Vehicle engineering |
| TVCD | Thrust Vector Control Driver | In English | → Vehicle engineering |
| TVCN | Tech Coast Venture Network | In English | |
| TVCS | Thrust Vector Control System | In English | → Vehicle engineering |
| TVD | Total Variation Diminishing | In English | |
| TVE | Technology Validation Experiment | In English | → Engineering, technology |
| TVE | Test Evaluation Experiment | In English | → Quality management |
| TVEXPIS | TV Experiment Interconnecting Station | In English | → Telecommunications |
| TVMA | Texas Veterinary Medical Association (www.tvma.org) | In English | → Associations → Veterinary medicine → United States |
| TVN | Test Verification Network | In English | → Quality management |
| TVP | Test Verification Program | In English | → Quality management |
| TVS | Toxic Vapor Suit | In English | |
| TVS | Transient Voltage Suppressor | In English | → Electronics |
| TVS | Transient Voltage Suppression | In English | → Electronics |
| TVSA | Thrust Vector Servoamplifier | In English | → Vehicle engineering |
| TVSSIS | TV Subsystem Interconnecting Station | In English | → Telecommunications |
| TVT | Thermal Vacuum Test | In English | |
| TVTA | Thermal Vacuum Test Article | In English | |
| TW | Tactical Warning | In English | |
| TW | Tail Wind | In English | |
| TW | Threat Warning | In English | |
| TW | Thumb Wheel | In English | |
| TW | Traveling Wave | In English | |
| TW/AA | Tactical Warning/Attack Assessment | In English | → Military affairs → Military engineering |
| TWD | Tail Wags Dog | In English | |
| TWG | Transition Working Group | In English | |
| TWL | Threat Wavelength | In English | |
| TWMF | Tumbling Waters Museum of Flags | In English | → Museums → Flags, banners |
| TWT | Transonic Wind Tunnel | In English | → Aerodynamics |
| TWT | Traveling-Wave Tube | In English | → Electromagnetism |
| TWTA | Travelling Wave Tube Amplifier | In English | |
| TWTA | Traveling-Wave Tube Amplifier | In English | → Electromagnetism |
| TWU | Transportation Workers Union of America (www.twu.com) | In English | → Organizations and associations → Labour, labour economics → Transport and postal services → United States |
| TWX | Teletype Wire Transmission | In English | → Telecommunications |
| TX | Transmit Channel | In English | → Telecommunications |
| TX-0 | Transistorized Experimental computer zero | In English | → Computer hardware |
| TxDOT | Texas Department of Transportation | In English | → Regional administration → Transport and postal services → Vehicle engineering → United States |
| TYLCV | Tomato Yellow Leaf Curl Virus | In English | → Virology → Agricultural sciences |
| TZB | The Zandvoort Boys | In English | → Organizations and associations → Sport, physical exercises |
| U | Uridine | In English | → Genetics → Biochemistry, biophysics |
| U | Uranium = U | Uranio | In Esperanto = U | Uranium | In French = U | Uran | In Tosk = U | يورانيوم | In French = U | Uran | In Azerbaijani = U | Уран | In Belarusian = U | Уран | In Bulgarian = U | ইউরেনিয়াম | In Bengali = U | Uranijum | In Bosnian = U | Urani | In Catalan = U | Uraniu | In Corsican = U | Uran | In Czech = U | Uran | In Danish = U | Uran | In German = U | Ουράνιο | In Greek = U | Uranio | In Spanish = U | Uraan | In Estonian = U | Uranio | In Basque = U | اورانیوم | In Persian = U | Uraani | In Finnish = U | Urani | In Friulian = U | Uranio | In Galician = U | אורניום | In Hebrew = U | Uranij | In Croatian = U | Iranyòm | In Haitian Creole = U | Urán | In Hungarian = U | Ուրան (տարր) | In Armenian = U | Uranium | In Indonesian = U | Uranio | In Ido = U | Úran | In Icelandic = U | Uranio | In Italian = U | ウラン | In Japanese = U | jinmrvurani | In Lojban = U | ಯುರೇನಿಯಮ್ | In Kannada = U | 우라늄 | In Korean = U | Uranium | In Latin = U | Uran | In Letzeburgesh = U | Uranas | In Lithuanian = U | Urāns | In Latvian = U | യുറേനിയം | In Malayalam = U | Ilhuicateōtepoztli | En Nahuatl = U | Uran | In Low German = U | Uranium | In Dutch = U | Uran | In Nynorsk = U | Uran | In Norwegian = U | Uran | In Polish = U | Urânio | In Portuguese = U | Uranyu | In Quechua = U | Uraniu | In Romanian = U | Уран | In Russian = U | यूरानियम | In Sanskrit = U | Uraniu | In Sicilian = U | Uranijum | In Serbo-Croatian = U | Urán | In Slovak = U | Uran | In Slovenian = U | Urani | In Albanian = U | Уранијум | In Serbian = U | Uran | In Swedish = U | Urani | In Swahili = U | யுரேனியம் | In Tamil = U | ยูเรเนียม | In Thai = U | Uranyo | In Tagalog = U | Uranyum | In Turkish = U | Уран | In Ukrainian = U | Urani | In Vietnamese = U | 鈾 | In Chinese |
In English | → Chemistry |
| U&E | Usability & Ergonomie | In English | → Human-computer interaction |
| UA | Urban Anthropology | In English | → Serial publications, periodicals → Anthropology → Sociology |
| UA | Uniform Allowance | In English | → Military affairs |
| UAD | User Accommodation Document | In English | |
| UAE | United Arab Emirates | In English | → Geography |
| uAEM | Universities Allied for Essential Medicines | In English | → Higher education, universities → Medicine |
| UAL | United Airlines (https://www.united.com) | In English | → Transport by air → United States |
| UAM | User Authentification Module | In English | → Software |
| UAM | University Art Museum | In English | → Museums → Higher education, universities → Arts |
| UAM | United Adult Ministries | In English | → Christianity |
| UAMS | University of Antwerp Management School | In English | → Higher education, universities → Management → Belgium |
| UAOD | The United Ancient Order Of Druids | In English | → Organizations and associations → Modern spiritual movements |
| UAPET | Updates in Applied Physics and Electrical Technology | In English | → Serial publications, periodicals → Engineering, technology → Electrical engineering |
| UAR | Upper Austrian Research (https://www.uar.at/) | In English | → Research institutes → Research policy → Engineering, technology → Austria |
| UARS | Upper Atmosphere Research Satellite | In English | → Meteorology, climatology → Astronautics |
| UART | Universal Asynchronous Receiver Transmitter | In English | → Telecommunications |
| UART | Universal Asynchronous Receiver-Transmitter | In English | → Data → Networks, communication |
| UAS | Urban Aboriginal Strategy | In English | → Regional planning |
| UASER | Ultrasound Amplification by Stimulated Emission of Radiation | In English | → Engineering, technology → Acoustics |
| UAW | United Auto Workers | In English | → Organizations and associations → Labour, labour economics → Automobile manufacturing |
| UB | Utility Bridge | In English | → Civil engineering → Construction |
| UBAA | University at Buffalo Alumni Association (www.alumni.buffalo.edu) | In English | → Associations → Higher education, universities |
| UBE | University at Buffalo Experience | In English | → Higher education, universities |
| UBER | Undetected Bit Error Rate | In English | → Computer science |
| UBF | University of Buffalo Foundation (http://ubfoundation.buffalo.edu) | In English | → Foundations → Higher education, universities |
| UBF | Unique Brand Factory (www.ubf.com.tr) | In English | → Advertising |
| UBMD | University at Buffalo Medical Doctor | In English | → Higher education, universities → Medicine |
| UBR | Unspecified Bit-Rate | In English | → Computer science |
| UC | Unsatisfactory Condition | In English | → Quality management |
| UC | Ulcerative Colitis | In English | → Pathology |
| UCA | Uniform Chart of Accounts | In English | |
| UCAF | Universal Cardholder Authentication Field | In English | → Computer-based techniques → Electronics |
| UCAR | Unsatisfactory Condition Action Report | In English | → Quality management |
| UCC | Uniform Code Council | In English | → Organizations and associations |
| UCC | Universal Checkout Console | In English | → Computer hardware → Human-computer interaction |
| UCC | Uniform Commercial Code | In English | → Trade |
| UCD | Urine Collection Device | In English | → Environmental technology, water supply, waste management |
| UCE | Unsolicited Commercial Email | In English | → Networks, communication → Telecommunications |
| UCEC | Universal Content Extented Classification | In English | → Computer science |
| UCH | Ubiquitin Carboxy-terminal Hydrolase | In English | → Enzymes |
| UCI | University Community Initiative | In English | → Higher education, universities |
| UCKG | Universal Church of the Kingdom of God = EURD | Église Universelle du Royaume de Dieu | In French = IURD | Iglesia Universal del Reino de Dios | In Spanish = IURD | Igreja Universal do Reino de Deus | In Portuguese |
In English | → Christianity → Modern spiritual movements |
| UCL | University College London (https://www.ucl.ac.uk) | In English | → Higher education, universities → United Kingdom |
| UCLA | University of California, Los Angeles (www.ucla.edu) | In English | → Higher education, universities → United States |
| UCLAP | University of California Los Angeles - Astronomical Papers | In English | → Serial publications, periodicals → Astronomy → United States |
| UCN | Uniform Control Number | In English | |
| UCODEP | Unity and Cooperation for Development of People | In English | → Organizations and associations → Development |
| UCR | Unsatisfactory Condition Report | In English | → Quality management |
| UCS | Universal Character Set | In English | → Writing systems → Data |
| UCS | Universal Control System | In English | |
| UCS | Utilities Control System | In English | |
| UCSC | University of California at Santa Cruz (https://www.ucsc.edu/) | In English | → Higher education, universities → United States |
| UCTA | Urine Collection Transfer Assembly | In English | → Environmental technology, water supply, waste management |
| UCW | Understanding Children's Work and its Impact | In English | → Organizations and associations → Labour, labour economics → Fundamental rights |
| UDA | User-Developed Application | In English | → Software |
| UDB | Update Buffer | In English | |
| UDC | Universal Decimal Classification = UDK | Universala Dekuma Klasifiko | In Esperanto = CDU | Classification Décimale Universelle | In French = UDC | Universele Decimale Classificatie | In Dutch = CDU | Clasificación Decimal Universal | In Spanish = UDC | Universel Decimal Classifikation | In Danish |
In English | → Libraries |
| UDC | Utility Distribution Center | In English | |
| UDDI | Universal Description Discovery and Integration | In English | → Networks, communication → Telecommunications |
| UDF | Unit Development Folder | In English | |
| UDHR | Universal Declaration of Human Rights = UDHR | Universala Deklaracio de Homaj Rajtoj | In Esperanto = DUDH | Déclaration Universelle des Droits de l'Homme | In French = DUDH | Declaración Universal de los Derechos Humanos | In Spanish = GEAU | Giza Eskubideen Aldarrikapen Unibertsala | In Basque = VDLP | Všeobecná deklarace lidských práv | In Czech = UVMR | Universele Verklaring van Menseregte | In Afrikaans = DUDH | Declaración Universal dos Dereitos Humanos | In Galician = MSÞ | Mannréttindayfirlýsing Sameinuðu þjóðanna | In Icelandic = DUDU | Dichiarazione Universale dei Diritti Umani | In Italian = PDPC | Powszechna Deklaracja Praw Człowieka | In Polish = DUDH | Declaração Universal dos Direitos Humanos | In Portuguese = DUDO | Declaraţia Universală a Drepturilor Omului | In Romanian = ВДПЧ | Всеобщая декларация прав человека | In Russian = İHEB | İnsan Hakları Evrensel Bildirisi | In Turkish |
In English | → Human rights |
| UDMH | Unsymmetrical Dimethylhydrazine | In English | → Chemical technology |
| UDMH/H | Unsymmetrical Dimethylhydrazine Hydrazine Blend | In English | → Chemical technology |
| UDO | Ultra Density Optical | In English | |
| UDOP | Ultrahigh Doppler | In English | |
| UDP | User Datagram Protocol | In English | → Networks, communication |
| UDP/IP | User datagram protocol/Internet Protocol | In English | → Internet |
| UDS | Universal Documentation System | In English | → Documentation → Knowledge management |
| UDS | Utility Distribution System | In English | |
| UDS | Uniform Data Systems | In English | → Data |
| UDSF | United Democratic Sudan Forum | In English | → Political parties and movements |
| UDTA | Ugandan Development Theater Association | In English | → Associations → Theatre |
| UDWDM | Ultra Dense Wavelength Division Multiplexing | In English | → Networks, communication → Telecommunications |
| UE | User Equipment | In English | |
| UEA | University of East Anglia (www.uea.ac.uk) | In English | → Higher education, universities → United Kingdom |
| UEA | Utah Education Association | In English | → Associations → Education → United States |
| UEA | United Energy Associates (www.uea.com) | In English | → Energy economics → Electrical engineering → Environmental technology, water supply, waste management |
| UEA | Urban Exploration Alberta | In English | → Civil engineering → Canada |
| UECBu | University Electro-Communications Bulletin | In English | → Serial publications, periodicals → Telecommunications |
| UEF | Union of European Federalists = UEF | Unio de la Europaj Federistoj | In Esperanto |
In English | → Political parties and movements |
| UEFA | Union of European Football Associations (www.uefa.com) = UEFA | Union Européenne de Football Association | In French |
In English | → Organizations and associations → Football and rugby |
| UEN | Union for Europe of the Nations (www.uengroup.org) = UEN | Union pour l'Europe des nations | In French = UEN | Union für ein Europa der Nationen | In German = UEN | Unio por Eŭropo de Nacioj | In Esperanto = UEN | Unión por la Europa de las Naciones | In Spanish = UEN | Unión pola Europa das Nacións | In Galician = UEN | Unione per l'Europa delle Nazioni | In Italian = UEN | Unie voor een Europa van Nationale Staten | In Dutch = UEN | Unia na rzecz Europy Narodów | In Polish = UEN | União para a Europa das Nações | In Portuguese = UNE | Unionen för nationernas Europa | In Swedish |
In English | → Political parties and movements → European Union |
| UEP | Undergraduate Exchange Program | In English | → Education |
| UER | Unique-Equipment Register | In English | |
| UES | Unified Energy System = ЕЭС | Единые Энергетические Системы | In Russian |
In English | → Energy economics → Electrical engineering |
| UETP | University Enterprise Training Partnership | In English | → Higher education, universities → Labour, labour economics |
| UFAS | Uniform Federal Accessibility Standards | In English | → Standardization |
| UFAW | Universities Federation for Animal Welfare (www.ufaw.org.uk) | In English | → Organizations and associations → Higher education, universities → Veterinary medicine → United Kingdom |
| UFD | User File Directory | In English | → Software → Files |
| UFE | Uterine Fibroid Embolisation | In English | → Medicine |
| UFO | Unidentified Flying Object = OVNI | Objet Volant Non Identifié | In French = OVNI | Objecte Volador No Identificat | In Catalan = НЛО | Неидентифициран летящ обект | In Bulgarian = OVNI | Objeto Volador No Identificado | In Spanish = UFO | Unidentifiziertes Flugobjekt | In German = UFO | Unknown Flying Object | In English = UFO | Uidentificeret flyvende objekt | In Danish = NIFO | Neidentigita Fluganta Objekto | In Esperanto = UFO | Unbekend fleanend objekt | In Frisian = עב"מ | עצם בלתי מזוהה | In Hebrew = OVNI | Oggetto Volante Non Identificato | In Italian = NLO | Neidentificēts lidojošs objekts | In Latvian = UFO | Uidentifisert flygende objekt | In Norwegian = UFO | Uidentifisert flygande objekt | In Nynorsk = NOL | Niezidentyfikowany Obiekt Latający | In Polish = OVNI | Objeto Voador Não Identificado | In Portuguese = OZN | Obiect Zburător Neidentificat | In Romanian = НЛО | Неопознанный летающий объект | In Russian = NLO | Neidentifikovani leteći objekat | In Serbo-Croatian |
In English | → Astronautics |
| UFO | Unknown Flying Object = OVNI, НЛО, NIFO, עב"מ, NLO, NOL, OZN (look above) |
In English | → Astronautics |
| UFP | United Federation of Planets | In English | → Organizations and associations → Politics → Literature |
| UGC | University Grants Committee | In English | → Higher education, universities |
| UGC | User Generated Content | In English | → Networks, communication → Computer-based techniques |
| UGL | Undergraduate Library | In English | → Libraries → Education |
| UGSJR | US Geological Survey Journal Research | In English | → Serial publications, periodicals → Earth sciences → United States |
| UHA | Ukrainian Historical Association | In English | → Associations → History |
| UHA | Urban History Association | In English | → Associations → 93031 |
| UHCCI | Union of Hellenic Chambers of Commerce and Industry | In English | → Organizations and associations → Trade → Industry, industrial policy → Greece |
| UHF | Ultrahigh Frequency | In English | |
| UHF | Ultra High Frequency = УКВ | Ультракороткие волны | In Russian = UKW | Ultrakurzwelle | In German |
In English | → Telecommunications |
| UHF/VHF | Ultra High Frequency/Very High Frequency | In English | → Telecommunications |
| UHT | Umbilical Handling Technician | In English | |
| UI | User Interface | In English | → Human-computer interaction |
| UIA | Uganda Investment Authority | In English | → 33972 |
| UIC | University of Illinois at Chicago (www.uic.edu) | In English | → Higher education, universities → United States |
| UIC | Universal Instruments Corporation | In English | → Engineering, technology |
| UIC | Unit Identification Code | In English | |
| UICB | International Union of Building Centres (www.uicb.org) | In English | → Organizations and associations → Construction |
| UICC | Universal Integrated Circuit Card | In English | → Electronics |
| UIIP | User Integration Implementation Plan | In English | |
| UIMA | Unstructured Information Management Architecture | In English | → Software |
| UIML | User Interface Markup Language | In English | → Programming languages → Human-computer interaction |
| UIMS | User Interface Management System | In English | → Human-computer interaction |
| UIR | Universal Infrared Receiver | In English | → Computer hardware → Peripheral devices |
| UIRF | University of Iowa Research Foundation (http://research.uiowa.edu/techtransfer/) | In English | → Foundations → Higher education, universities → United States |
| UIT | Ultraviolet Imaging Telescope | In English | → Astronomy |
| UIUC | University of Illinois at Urbana-Champaign | In English | → Higher education, universities → United States |
| UIUC DLI | University of Illinois at Urbana-Champaign Digital Library Initiative | In English | → Libraries → Data → United States |
| UIWG | User Interface Working Group | In English | → Human-computer interaction |
| UK | United Kingdom | In English | → Geography |
| UKAEA | United Kingdom Atomic Energy Agency | In English | → Public administration, government → Energy economics → Nuclear technology |
| UKERF | University of Kentucky Equine Research Foundation | In English | → Foundations → Zoology |
| UKERNA | United Kingdom Education and Research Networking Association | In English | → Associations → Education → Research policy |
| UKIB | United Kingdom Independent Broadcasting | In English | → Telecommunications |
| UKIERI | United Kingdom-India Education Research Initiative (www.ukieri.org) | In English | → Education |
| UKIPG | United Kingdom Interprofessional Group | In English | → Organizations and associations → Labour, labour economics |
| UkMJ | Ukranian Mathematical Journal = UkMaZ | Ukrainskii Matematicheskii Zhurnal | In Russian |
In English | → Serial publications, periodicals → Mathematics |