

| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| TSO | Time-Sharing Option | In English | |
| TSO | Technisch Secundair Onderwijs | In Dutch | → Education → Engineering, technology | 
| TSO | Time Sharing Option | In English | → Software | 
| TSOP | The Society for Organic Petrology (www.tsop.org) | In English | → Organizations and associations → Petrology | 
| TSP | Test Software Program | In English | → Computer programs | 
| TSP | Trajectory Shaping Program | In English | → Computer programs → Astronautics | 
| TSP | Trajectory Synthesis Program | In English | → Computer programs → Astronautics | 
| TSP | Twisted Shielded Pair | In English | |
| TSP | Terminal de Saisie Portable | In French | → Peripheral devices | 
| TsPK | Tsentr Podgotovka Kosmonavti | In Russian | → Specialized or polytechnical colleges → Astronautics | 
| TSR | Technical Status Review | In English | |
| TSR | Test Schedule Report | In English | |
| TSR | Test Status Report | In English | |
| TSR | Trade Study Report | In English | |
| TSRA | Total System Requirements Analysis | In English | |
| TSRS | Tarybu Socialistiniu Respubliku Sajunga = URSS | Unaniezh ar Republikoù Sokialour Soviedel | In Breton = URSS | Union des Républiques Socialistes Soviétiques | In French = USSR | Unie van Sosialistiese Sowjetrepublieke | In Afrikaans = USSR | Union of Soviet Socialist Republics | In English = СССР | Сою́з Сове́тских Социалисти́ческих Респу́блик | In Russian = CCCP | Съюзът на съветските социалистически републики | In Bulgarian = SSSR | Soyuz Sovetskikh Sotsialisticheskikh Respublik | In Russian = URSS | Unión de Republicas Sozialistas Sobieticas | In Aragonese = XRSS | Xunión de les Repúbliques Socialistes Soviétiques | In Asturian = SSRİ | Sovet Sosialist Respublikaları İttifaqı | In Azerbaijani = SSSR | Savez Sovjetskih Socijalističkih Republika | In Serbo-Croatian = URSS | Unió de Repúbliques Socialistes Soviètiques | In Catalan = SSSR | Svaz sovětských socialistických republik | In Czech = USSR | Unio de Sovetaj Socialismaj Respublikoj | In Esperanto = CCCP | Социаллă Совет Республикисен Союзĕ | In Chuvash = USSR | Unionen af Socialistiske Sovjetrepublikker | In Danish = URSS | Unione delle Repubbliche Socialiste Sovietiche | In Italian = ZSRR | Związek Socjalistycznych Republik Radzieckich | In Polish = SSKS | Szovjet Szocialista Köztársaságok Szövetsége | In Hungarian = UdSSR | Union der Sozialistischen Sowjetrepubliken | In German = ΕΣΣΔ | Ένωση Σοβιετικών Σοσιαλιστικών Δημοκρατιών | In Greek = URSS | Unión de Repúblicas Socialistas Soviéticas | In Spanish = NSVL | Nõukogude Sotsialistlike Vabariikide Liit | In Estonian = SESB | Sobietar Errepublika Sozialisten Batasuna | In Basque = USSR | Uny fan Sosjalistyske Sowjetrepublyken | In Frisian = ԽՍՀՄ | Խորհրդային Սոցիալիստական Հանրապետությունների Միություն | In Armenian = URSS | Unión das Repúblicas Socialistas Soviéticas | In Galician = სსრკ | საბჭოთა სოციალისტური რესპუბლიკების კავშირი | In Georgian = URSS | Unio Rerum Publicarum Socialisticarum Sovieticarum | In Latin = CCPC | Советтик Социалисттик Республикалар Союзу | In Kirghiz = UdSSR | Unioun vun de Sozialistesche Sowjetrepubliken | In Letzeburgesh = PSRS | Padomju Sociālistisko Republiku Savienība | In Latvian = СССР | Сојуз на Советските Социјалистички Републики | In Macedonian = УРСС | Униуня Републичилор советиче Сочиалисте | In Moldavan = KRSS | Kesatuan Republik Sosialis Soviet | In Malay = USSR | Unie van Socialistische Sovjetrepublieken | In Dutch = SSSR | Sambandet av Sosialistiske Sovjet-Republikkar | In Nynorsk = SSSR | Samveldet av sovjetiske sosialistrepublikker | In Norwegian = URSS | Unnion d'Républyiques Socialistes Soviétiques | In Norman = URSS | União das Repúblicas Socialistas Soviéticas | In Portuguese = URSS | Union de las Republicas Socialistas Sovieticas | In Occitan = SSRH | Susyalista Suwit Republikakunap Huñun | In Quechua = ССРЦ | Советон Социалистон Республикæты Цæдис | In Ossetian = URSS | Uniunea Republicilor Sovietice Socialiste | In Romanian = URSS | Unioni dî ripùbblichi sucialisti suviètichi | In Sicilian = ZSSR | Zveza sovjetskih socialističnih republik | In Slovenian = СССР | Савез Совјетских Социјалистичких Република | In Serbian = SSCB | Sovyet Sosyalist Cumhuriyetler Birliği | In Turkish = СРСР | Союз Радянських Соціалістичних Республік | In Ukrainian = SSRB | Sovet Sosialistik Republiklar Berlege | In Tatar = SSRI | Sovet Sotsialistik Respublikalar Ittifoqi | In Uzbek | In Baltic languages | → International relations → Geography | 
| TSS | Test Suite Structure | In English | |
| TSS | Tethered Satellite System | In English | → Astronautics | 
| TSS | Telephony Softswitch | In English | → Telecommunications | 
| TSS | Telemetry Simulation/System | In English | |
| TSS | Terminal Security System | In English | |
| TSS | Terminal Support System | In English | |
| TSS | Test Software Support | In English | → Software | 
| TSS | Test Support System | In English | |
| TSS | Time-Sharing System | In English | |
| TSS | Tug Structural Support | In English | |
| TSS | Time Sharing System | In English | → Operating systems | 
| TSS | Tarif Spécial de Solidarité | In French | → Prices → Energy economics | 
| TSS&TP | Test Suite Structure and Test Purpose | In English | |
| TSSG | Trondheimstudentenes Speidergruppe | In Norwegian | → Organizations and associations → Higher education, universities | 
| TSSLW | Travaux de la Société des Sciences et des Lettres de Wroclaw | In French | → Serial publications, periodicals → Mathematics and natural sciences → Language, linguistics, literature | 
| TSSU | Test Signal Switching Unit | In English | |
| TST | Time-Sharing Terminal | In English | |
| TST | Travaux Sous Tension | In French | → Electrical engineering | 
| TSU | Time Standard Unit | In English | |
| TsUP | Tsentr Upravileniya Polyoti | In Russian | |
| TSUS | Technický a skúšobný ústav stavebný | In Czech | |
| TSV | Tegelsche Sport Vereeniging | In Dutch | → Organizations and associations → Sport, physical exercises | 
| TSV | Transformateur Service Vénissieux | In English | → Electrical engineering | 
| TSV | Tir Sportif de Vitesse | In English | → Sport, physical exercises | 
| TSV | Télé Sud Vendée | In English | → Telecommunications → Entertainment | 
| TSV | Teinte, Saturation, Valeur = HSV | Hue, Saturation, Value | In English = HSB | Hue, Saturation, Brightness | In English | In French | → Graphic industries, printing, publishing | 
| TSW | Test Software | In English | → Software | 
| TT | Tiroler Tageszeitung | In German | → Newspapers, journalism | 
| TT | TEJO-Tutmonde | In Esperanto | → Serial publications, periodicals | 
| TT | Terminal Timing | In English | → Quality management | 
| TT | Thrust Termination | In English | → Vehicle engineering | 
| TT&C | Telemetry, Tracking, and Communications | In English | → Astronautics → Telecommunications | 
| TT&C | Tracking, Telemetry, and Command | In English | → Astronautics | 
| TT&C | Tracking, Telemetry, and Control | In English | → Astronautics | 
| TT&E | Test, Teardown, and Evaluation | In English | → Quality management | 
| TTA | Thermomechanical Test Area | In English | → Mechanical engineering | 
| TTA | Time To Apogee | In English | → Astronomy → Astronautics | 
| TTA | Tramway Touristique de l'Aisne (https://www.tta.be) | In French | → Rail transport → Tourism → Belgium | 
| TTB | Technology Test Bed | In English | → Quality management | 
| TTBOOK | To the Best of Our Knowledge | In English | |
| TTBS | Trinidad and Tobago Bureau of Standards | In English | → Organizations and associations → Standardization | 
| TTBS | Toruńskie Towarzystwo Budownictwa Społecznego Spółka | In Polish | |
| TTBS | Thames Traditional Boat Society | In English | → Organizations and associations → 6295 | 
| TTBS | Tomaszowskie Towarzystwo Budownictwa Społecznego | In Polish | |
| TTBS | Tyskie Towarzystwo Budownictwa Społecznego | In Polish | |
| TTBS | Tarnobrzeskie Towarzystwo Budownictwa Społecznego | In Polish | |
| TTBS | Timber Trades' Benevolent Society (www.ttbs.org.uk) | In English | → Organizations and associations → Timber and woodworking industry → United Kingdom | 
| TTBS | Trade Technology Business Show | In English | → Trade | 
| TTC | Telecommunications Technology Committee | In English | → Telecommunications | 
| TTC | Telemetry, Telecommand and Control | In English | → Astronautics | 
| TTC | Telecommunication Technology Committee | In English | |
| TTC | Tunnel Thermal Control | In English | |
| TTC | Toutes Taxes Comprises | In French | → Taxes, duties → Accounting | 
| TTCA | Thrust Translation Controller Assembly | In English | → Vehicle engineering | 
| TTCN | Tree and Tabular Combined Notation | In English | → Programming languages → Networks, communication | 
| TTCV | Tracking, Telemetry, Command, and Voice | In English | → Astronautics → Telecommunications | 
| TTD | Temps de Thromboplastine Dilué | In French | → Blood and circulatory system | 
| TTE | Test Teardown and Evaluation | In English | |
| TTE | Time To Event | In English | |
| TTE | Transthoracic Echocardiography | In English | → Diagnostics → Cardiology | 
| TTEL | Tool and Test Equipment List | In English | |
| TTENP | Transport Électricité Normandie Paris | In French | → Electrical engineering → France | 
| TTESP | Test Time Event Sequencer Plan | In English | |
| TTF | Transition Task Force | In English | |
| TTG | Transition Task Group | In English | |
| TTI | Translation Technologies, Inc. (www.translationtech.com) | In English | → Computer-based techniques → Translation → Linguistics | 
| TTL | Transistor-Transistor Logic | In English | → Electronics | 
| TTL | Technology Transfer and Licensing | In English | → Industrial property → Engineering, technology | 
| TTL | Transistor Transistor Logic | In English | → Computer hardware | 
| TTL | Through The Lens | In English | → Photography | 
| TTM | Turntablist Transcription Methodology | In English | → Music | 
| TTO | Technology Transfer Office | In English | → Engineering, technology | 
| TTO | Tweetalig Onderwijs | In Dutch | → Education | 
| TTOF | Thermally Tunable Optical Filter | In English | |
| TTP | Time Triggered Protocel | In English | |
| TTP | Time Triggered Protocol | In English | → Engineering, technology | 
| TTP | Transports Terrestres Promotion | In French | → Transport and postal services | 
| TTP | Thrombotic Thrombocytopenic Purpura | In English | → Blood and circulatory system → Pathology | 
| TTP | Time To Perigee | In English | → Astronomy → Astronautics | 
| TTP | Trends in Theoretical Physics | In English | → Serial publications, periodicals → Physics | 
| TTPA | Temps de Thromboplastine Partielle Activée | In French | → Blood and circulatory system | 
| TTRA | Travel and Tourism Research Association (www.ttra.com) | In English | → Associations → Tourism | 
| TTRT | Türkiye Radyo-Televizyon Kurumu (www.trt.net.tr) | In Turkish | → Telecommunications → Turkey | 
| TTS | Titre de Travail Simplifié | In French | → Labour, labour economics | 
| TTSP | Transport Theory and Statistical Physics | In English | → Serial publications, periodicals → Physics | 
| TTT | Tut-Tera Teksaĵo = WWW | World Wide Web | In English | In Esperanto | → Internet | 
| TTT | Teatro Trupo de Tuluzo | In Esperanto | → Organizations and associations → Theatre | 
| TTT | Tarptautinis Teisingumo Teismas (www.icj-cij.org) = CIJ | Cour Internationale de Justice | In French = CIJ | Corte Internacional de Justicia | In Spanish = ICJ | International Court of Justice | In English = CIJ | Corte Internacional de Justiça | In Portuguese = CIJ | Cort Internacional de Justícia | In Catalan = MSD | Mezinárodní soudní dvůr | In Czech = IGH | Internationaler Gerichtshof | In German = ΔΔΔ | Διεθνές Δικαστήριο της Δικαιοσύνης | In Greek = IK | Internacia Kortumo | In Esperanto = ICJ | 국제사법재판소 | In Korean = MTS | Międzynarodowy Trybunał Sprawiedliwości | In Polish = MSD | Medzinárodný súdny dvor | In Slovak = МСП | Међународни суд правде | In Serbian = MSP | Međunarodni sud pravde | In Serbo-Croatian | In Lithuanian | → International relations → Law, jurisprudence | 
| 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 | Toimihenkilöunioni | In Finnish | → Organizations and associations → Labour, labour economics | 
| 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 | 
| TÜBİSAD | Türkiye Bilişim Sanayicileri ve İşadamları Derneği (www.tubisad.org.tr) | In Turkish | → Associations → Computer science → Telecommunications → Turkey | 
| TÜBİTAK | Türkiye Bilimsel ve Teknik Araştırma Kurumu | In Turkish | |
| TÜBİTAK | Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (https://www.tubitak.gov.tr) | In Turkish | → Organizations and associations → Research policy → Engineering, technology → Turkey | 
| 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 | 
| TUD | Technische Universiteit Delft (www.tudelft.nl) | In Dutch | → Specialized or polytechnical colleges → Higher education, universities → Netherlands | 
| TUE | Tratado de la Unión Europea | In Spanish | → International relations | 
| 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 | |
| TUHH | Technische Universität Hamburg-Harburg | In German | → Higher education, universities | 
| TUISR | Tokyo University Institute Industrial Science Report | In English | → Serial publications, periodicals → Mathematics and natural sciences → Applied sciences, technology | 
| TULIPE | Transfert d'Urgence de l'Industrie Pharmaceutique | In French | → Pharmacology, toxicology | 
| TULP | Tot Ut Lest Paraat | In Dutch | → Organizations and associations → Sport, physical exercises | 
| TUM | Technische Universität München (https://www.tum.de/) | In German | → Specialized or polytechnical colleges → Higher education, universities → Germany | 
| TUNEL | Terminal deoxynucleotidyltransferase-mediated dUTP-biotin Nick End Labeling | In English | → Biochemistry, biophysics | 
| TURP | Tarifs d'Utilisation des Réseaux Publics | In French | → Electrical engineering | 
| TUS | Tıpta Uzmanlık Eğitimi Giriş Sınavı | In Turkish | → Higher education, universities → Medicine | 
| TÜSİAD | Türk Sanayicileri ve İşadamları Derneği (http://https://tusiad.org/tr/ ) | In Turkish | → Associations → Industry, industrial policy → Trade → Turkey | 
| TUSTEP | Tübingen System of TExt processing Programs | In English | |
| TÜV | Technischer Überwachungsverein | In German | → Organizations and associations → Applied sciences, technology | 
| 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 | Taxe sur la Valeur Ajoutée | In French | → Taxes, duties → Accounting | 
| TVA | Taxa pe valoarea adăugată = BTW | Belasting op Toegevoegde Waarde | In Afrikaans = IVA | Impost sobre el valor afegit | In Catalan = PDV | Porez na dodatu vrijednost | In Bosnian = ДДС | Данъкът върху добавената стойност | In Bulgarian = VAT | Value Added Tax | In English = AVI | Aldonvalora imposto | In Esperanto = ΦΠΑ | Φόρος Προστιθέμενης Αξίας | In Greek = DPH | Daň z přidané hodnoty | In Czech = Moms | Meromsætningsafgift | In Danish = IVA | Impuesto al Valor Agregado | In Spanish = MwSt | Mehrwertsteuer | In German = BTW | Belasting over de Toegevoegde Waarde | In Dutch = MVA | Merverdiavgift | In Norwegian = PVM | Pridėtinės vertės mokestis | In Lithuanian = IVA | Imposta sul Valore Aggiunto | In Italian = VASK | Virðisaukaskattur | In Icelandic = PPN | Pajak Pertambahan Nilai | In Indonesian = Áfa | Általános forgalmi adó | In Hungarian = PDV | Porez na dodanu vrijednost | In Croatian = ALV | Arvonlisävero | In Finnish = מע"מ | מס ערך מוסף | In Hebrew = KDV | Katma Değer Vergisi | In Turkish = VAT | ภาษีมูลค่าเพิ่ม | In Thai = VAT | மதிப்புக் கூட்டு வரி | In Tamil = DPH | Daň z pridanej hodnoty | In Slovak = НДС | Налог на добавленную стоимость | In Russian = IVA | Imposto sobre o Valor Acrescentado | In Portuguese = VAT | 增值税 | In Chinese | In Romanian | → Taxes, duties | 
| 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 | 
| TVC | Tubbergense Voetbal Club | In Dutch | → Organizations and associations → Football and rugby | 
| TVC | Tarsisius Voetbal Club | In Dutch | → Organizations and associations → Football and rugby | 
| TVCD | Thrust Vector Control Driver | In English | → Vehicle engineering | 
| TVCG | Televizija Crne Gore | In Serbian | → Telecommunications | 
| 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 | 
| TVFI | Télévision Française Internationale | In French | → Telecommunications → France | 
| TVH | Taxe de Vente Harmonisée | In French | → Taxes, duties | 
| TVHD | Télévision Haute Définition | In French | → Telecommunications | 
| TVK | Toimi- ja virkamiesjärjestöjen Keskusliitto | In Finnish | |
| TVMA | Texas Veterinary Medical Association (www.tvma.org) | In English | → Associations → Veterinary medicine → United States | 
| TVN | Test Verification Network | In English | → Quality management | 
| TVO | Tot Vriendschap Opgericht | In Dutch | → Organizations and associations → Sport, physical exercises | 
| TVO | Trouble Ventilatoire Obstructif | In French | → Chest diseases | 
| TVP | Thrombose Veineuse Profonde | In French | → Blood and circulatory system → Pathology | 
| TVP | Test Verification Program | In English | → Quality management | 
| TVR | Televiziunea Română | In Romanian | → Telecommunications | 
| 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 | 
| TVSML | Télévision Mobile Sans Limite | In French | → Telecommunications | 
| TVSSIS | TV Subsystem Interconnecting Station | In English | → Telecommunications | 
| TVT | Thermal Vacuum Test | In English | |
| TVT | Toulon Var Technologies (www.tvt.fr) | In French | → Research policy → Engineering, technology → France | 
| TVTA | Thermal Vacuum Test Article | In English | |
| TVV | Turkse Voetbal Vereniging | In Dutch | → Organizations and associations → Football and rugby → Netherlands | 
| TVV | Tilburgsche Voetbal Vereeniging | In Dutch | → Organizations and associations → Football and rugby | 
| TVV | Turmac Voetbal Vereniging | In Dutch | → Organizations and associations → Football and rugby | 
| TW | Technische Wetenschappen | In Dutch | → Engineering, technology | 
| 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 | |
| TWFF | Tiroler Wirtschaftsförderungsfonds | In German | → Finance | 
| TWG | Transition Working Group | In English | |
| TWL | Threat Wavelength | In English | |
| TWM | Tuindorp Watergraafs Meer | In Dutch | → Organizations and associations → Sport, physical exercises | 
| 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 |