| SYNAD | Syndicat National des Adjuvants pour Bétons et Mortier (www.synad.fr) | In French | → Organizations and associations → Civil engineering → Building |
| SYNALAF | Syndicat National des Labels Avicoles de France | In French | → Organizations and associations → Agricultural sciences |
| SYNAMEC | Synthesis Tool for Aeronautical Mechanisms Design | In English | → Aeronautics, aircraft |
| SYNCOMECS | SYNthesis of Aeronautical COmpliant MEChanical Systems | In English | → Mechanical engineering → Aeronautics, aircraft |
| SynMe | Synthetic Metals | In English | → Serial publications, periodicals → Chemistry → Metallurgy |
| SYNPREFH | Syndicat National des Pharmaciens des Établissements Publics de Santé | In French | → Organizations and associations → Pharmacology, toxicology |
| SYSREM | System Requirements Engineering Methodology | In English | → Engineering, technology |
| SyTec | Systems Technology | In English | → Serial publications, periodicals → Engineering, technology |
| SYTRAL | SYndicat des TRansports en commun de l’Agglomération Lyonnaise | In French | → Organizations and associations → Transport and postal services |
| SZA | Schweißtechnische Zentralanstalt | In German | → Metallurgy |
| SZO | Svjetska zdravstvena organizacija = MOS | Monda Organiz(aĵ)o pri Sano | In Esperanto = WHO | World Health Organization | In English = OMS | Organisation Mondiale de la Santé | In Esperanto = OMS | Organizzazione Mondiale della Sanità | In Italian = WGO | Wêreldgesondheidsorganisasie | In Afrikaans = OMS | Organización Mundial de la Salú | In Asturian = СЗО | Световната здравна огранизация | In Bulgarian = SZO | Světová zdravotnická organizace | In Czech = OMS | Organització Mundial de la Salut | In Catalan = OMS | Organización Mundial de la Salud | In Spanish = MTO | Maailma Terviseorganisatsioon | In Estonian = MOE | Munduko Osasun Erakundea | In Basque = OMS | Organisacion mondiâla de la sandât | FRP = OMS | Organización Mundial da Saúde | In Galician = RTD | Rêxistina Tendurustiyê ya Dinyayê | In Kurdish = UMS | Urganizazziun mundiala da la Santaa | In Lombard = PSO | Pasaulio sveikatos organizacija | In Lithuanian = PVO | Pasaules veselības organizācija | In Latvian |
In Croatian | → United Nations → Medicine |
| SZO | Světová zdravotnická organizace = MOS, WHO, OMS, WGO, СЗО, MTO, MOE, RTD, UMS, PSO, PVO (look above) |
In Czech | → United Nations → Medicine |
| SZPC | Shandong Zhonghua Power Company | In English | → Electrical engineering |
| T&C | Test and Checkout | In English | → Engineering, technology |
| T&D | Transportation and Docking | In English | → Maintenance and logistics → Transport and postal services |
| TAA | Technical Assistance Agreement | In English | |
| TAB | Time After Burst | In English | → Spaceflight engineering, astronautics |
| TAB | Technical Advisory Board | In English | |
| TAB | Tape Automated Bonding | In English | → Electronics |
| TACAN | Tactical Air Navigation | In English | → Aeronautics, aircraft → Transport and postal services |
| TACAN | Tactical Air Control and Navigation | In English | → Aeronautics, aircraft → Transport and postal services |
| TACANS | Tactical Air Control And Navigation System | In English | → Aeronautics, aircraft → Transport and postal services |
| TACC | Tactical Air Control Center | In English | → Aeronautics, aircraft → Transport and postal services |
| TAdEN | Tutmonda Agado - Asocio de Esperantistaj Nefumantoj | In Esperanto | → Associations → Personal health and hygiene |
| TAEM | Terminal Area Energy Management | In English | → Energy economics |
| TAEMm | Tokyo Metropolitan College Aeronautical Engineering Memoirs | In English | → Serial publications, periodicals → Aeronautics, aircraft |
| TAG | Trouble Anxieux Généralisé | In French | → Neurology |
| TAGA | Technical Association of the Graphic Arts | In English | → Associations → Graphic industries, printing, publishing → Graphic arts |
| TAHD | Torrington Area Health District | In English | → Municipal administration → Medicine |
| TAHD | Telephone Accessible Holographic Data | In English | → Telecommunications |
| TAKE | Tutmonda Asocio de Konstruistoj Esperantistaj (http://take.esperanto.free.fr) | In Esperanto | → Associations → Building |
| TAL | Trans-Atlantic Abort Landing | In English | → Spaceflight engineering, astronautics |
| TAL | Transatlantic Abort Landing | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| TALAR | Tactical Approach and Landing Radar | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| TALO | Time After Lift-Off | In English | → Spaceflight engineering, astronautics |
| TAO | Therapeuten Ausbildungsorganisation | In English | → Education → Medicine |
| TAPIR | Transformateur d'Alimentation Provisoire Intégré sur Remorque | In French | → Electrical engineering → Food technology |
| TAPPI | Technical Association of Pulp and Paper Industry | In English | → Associations → Paper and board industry |
| TAR | Thin Air Rescue | In English | → Medicine |
| TARTAM | TArif Réglementé Transitoire d'Ajustement du Marché | In French | → Prices → Electrical engineering |
| TBC | The Boeing Company | In English | → Spaceflight engineering, astronautics |
| TBG | Gyro-To-Body Transformation Matrix | In English | → Mechanical engineering |
| TBI | Body Axis-To-Inertial Transformation Matrix | In English | → Mechanical engineering |
| TBM | Tactical Ballistic Missile | In English | → Military engineering |
| TBTO | Tributyltin Oxide | In English | → Chemical technology |
| TC | Thrust Chamber | In English | → Vehicle engineering |
| TC | Telecommunications | In English | → Telecommunications |
| TC | Technical Committee | In English | → Engineering, technology |
| TCA | Temps de Céphaline Activé | In French | → Medicine |
| TCASCR | Technology Centre of the Academy of Sciences of the Czech Republic | In English | → Engineering, technology |
| TCC | Transportation Control Center | In English | → Vehicle engineering |
| TCEM | Troisième Cycle des Études Médicales | In French | → Higher education, universities → Medicine |
| TCFN | Total Compagnie Française de Navigation | In French | → Transport and postal services → 665 |
| TCFP | Thrust Chamber Fuel Purge | In English | → Vehicle engineering |
| TCKT | Transfercenter für Kunststofftechnik (www.tckt.info) | In German | → Plastic industry |
| TCM | Traditionelle Chinesische Medizin | In German | → Medicine |
| TCM | Traditional Chinese Medicine | In English | → Medicine |
| TCMF | Total Compagnie Minière Française | In French | → Mining |
| TCMH | Teneur Corpusculaire Moyenne en Hémoglobine | In French | → Blood and circulatory system |
| TCN | Transportation Control Number | In English | → Vehicle engineering → Transport and postal services |
| TCR | T-Cell Receptor | In English | → Immunology and allergy |
| TCSP | Transport en Commun en Site Propre | In French | → Transport and postal services |
| TCV | Thrust Chamber Valve | In English | → Vehicle engineering |
| TD | Technology Demonstration | In English | → Engineering, technology |
| TD | Technology Data | In English | → Engineering, technology |
| TD&SA | Telephone, Data, and Special Audio | In English | → Telecommunications |
| TDA | Télédiffusion d'Algérie (www.tda.dz) | In French | → Telecommunications |
| TDAH | Trouble Déficit de l’Attention / Hyperactivité = ADHD | Attention Deficit / Hyperactivity Disorder | In English |
In French | → Neurology |
| TDAPR | Telecommunications and Data Acquisition Progress Report | In English | → Serial publications, periodicals → Data → Telecommunications |
| TdE | Transalpina di Energia | In Italian | → Energy economics |
| TDF | Télédiffusion de France | In French | → Telecommunications |
| TDG | Traffic Design Group | In English | → Transport and postal services |
| TDM | TrashDesignManufaktur | In German | → Environmental technology, water supply, waste management → Graphic arts |
| TDM | Technology Development Mission | In English | → Engineering, technology |
| TDMC | Taman Desa Medical Centre | In English | → Medicine |
| TDOA | Time Difference Of Arrival | In English | → Telecommunications |
| TDP | Technology Demonstration Plan | In English | → Engineering, technology |
| TDPD | Technical Data Program Document | In English | → Engineering, technology |
| TDR | Technical Data Report | In English | → Engineering, technology |
| TDR | Technical Documentation Report | In English | → Engineering, technology |
| TDR | Technical Design Review | In English | → Engineering, technology |
| TDR | Time Domain Reflectometer | In English | → Electronics |
| TDRS | Tracking and Data Relay Satellite | In English | → Spaceflight engineering, astronautics |
| TDRSS | Tracking and Data Relay Satellite System | In English | → Spaceflight engineering, astronautics |
| TDS | Technology Demonstration Satellite | In English | → Spaceflight engineering, astronautics |
| TE | Timing Electronics | In English | → Electronics |
| TE | Terminal Equipment | In English | → Telecommunications |
| TE | Thrombocytémie Essentielle | In French | → Blood and circulatory system → Pathology |
| TEA | Tipperary Energy Agency | In English | → Energy economics |
| TEA | Tranche en Arrêt | In French | → Nuclear technology → Electrical engineering |
| TEA | Transport Policy Evaluation and Analysis | In English | → Politics → Transport and postal services |
| TecN | Technical News | In English | → Serial publications, periodicals |
| TEF | Tuluzaj Esperantistaj Fervojistoj | In Esperanto | → Organizations and associations → Transport and postal services |
| TEF | Tranche en Fonctionnement | In French | → Nuclear technology → Electrical engineering |
| TEGI | Tractebel Electricity & Gas International | In English | → Energy economics → Electrical engineering |
| TekEL | Технiчна електродинамiка = TekEl | Tekhnicheskaia Elektrodinamika | In Russian |
In Russian | → Serial publications, periodicals → Electrical engineering |
| TekEl | Tekhnicheskaia Elektrodinamika = TekEL (look above) |
In Russian | → Serial publications, periodicals → Electrical engineering |
| TELEX | Telegraph EXchange | In English | → Telecommunications |
| TelIn | Telematics Informatics | In English | → Serial publications, periodicals → Computer science → Telecommunications |
| TEM | Tranche en Marche | In French | → Nuclear technology → Electrical engineering |
| TEMA | Türkiye Erozyonla Mücadele, Ağaçlandırma ve Doğal Varlıkları Koruma Vakfı (www.tema.org.tr) | In Turkish | → Foundations → Nature and society → Forestry |
| TEMASOL | Total EDF Maroc Solaire | In French | → Energy economics → Electrical engineering |
| TEN-T | Trans-European Networks-Transport | In English | → Transport and postal services |
| TENERRDIS | Technologies Énergies Nouvelles Énergies Renouvelables Rhône-Alpes, Drôme, Isère, Savoie | In French | → 6219 |
| TEO | Transport Électricité Ouest | In French | → Electrical engineering |
| TEOS | Tetraethyl Orthosilicate = TEOS | Tetraethylorthosilikat | In German |
In English | → Chemical technology |
| TEOS | Tetraethylorthosilikat = (look above) |
In German | → Chemical technology |
| TEP | Tonne Équivalent Pétrole | In French | → Energy economics → 665 |
| TePhL | Technical Physics Letters | In English | → Serial publications, periodicals |
| TER | Transports Express Régional | In French | → Transport and postal services |
| TERA | Transport Électricité Rhône-Alpes | In French | → Electrical engineering |
| TES | Transactions Électroniques Sécurisées | In French | → Networks, communication → Electronics → Telecommunications |
| TESE | Technologies et Économie des Sytèmes Électriques | In French | → Energy economics → Electrical engineering |
| TESE | Transport Électricité Sud-Est | In French | → Electrical engineering |
| TESO | Transport Électricité Sud-Ouest | In French | → Electrical engineering |
| TET | Trajectory Events Time Line | In English | → Spaceflight engineering, astronautics |
| TETRA | Terminal Tracking Telescope | In English | → Spaceflight engineering, astronautics |
| TETRA | Terrestrial Trunked Radio | In English | → Telecommunications |
| TEV | Target Engine Vehicle | In English | → Vehicle engineering |
| TEVA | Tutmonda Esperantista Vegetarana Asocio | In Esperanto | → Associations → Nutrition |
| TFA | Très Faible Activité | In French | → Nuclear technology |
| TFCS | Triplex Flight Control Subsystem | In English | → Spaceflight engineering, astronautics |
| TFI | Technology Flight Instrumentation | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| TFI | Time From Ignition | In English | → Spaceflight engineering, astronautics |
| TFL | Time From Launch | In English | → Spaceflight engineering, astronautics |
| TFS | Telemetry Format Selection | In English | → Spaceflight engineering, astronautics |
| TFT | Thin Film Transistor | In English | → Electronics |
| TGD | Tiergesundheitsdienst | In German | → Veterinary medicine |
| TGE | Très Grand(s) Équipement(s) | In French | → Engineering, technology |
| TGF | Tumor Growth Factor | In English | → Biochemistry, biophysics → Oncology |
| TGMH | Taux Globulaire Moyen d’Hémoglobine | In French | → Blood and circulatory system |
| TGS | Telemetry Ground System | In English | → Spaceflight engineering, astronautics |
| TGS | Telemetry Ground Station | In English | → Spaceflight engineering, astronautics |
| TGSE | Telemetry Ground Support Equipment | In English | → Spaceflight engineering, astronautics |
| TGV | Turbine - Gaz - Vapeur | In French | → Energy economics |
| TGV | Train à Grande Vitesse | In French | → Transport and postal services → Vehicle engineering |
| THA | Health Technology Assessment | In English | → Medicine |
| THADA | Trouble d'Hyperactivité Avec Déficit de l'Attention | In French | → Neurology |
| ThAFM | Theoretical and Applied Fracture Mechanics | In English | → Serial publications, periodicals → Mechanical engineering |
| THC | Textile - Habillement - Cuir | In French | → Leather industry → Textile industry |
| THEMIS | Technologies et Modélisation des Infrastructures des Systèmes Électriques | In French | → Electrical engineering |
| THEMIS | Time History of Events and Macroscale Interactions during Sunstorms | In English | → Astronomy → Spaceflight engineering, astronautics |
| ThF | Thermique à Flamme | In French | → Energy economics |
| THG | Technical Harmonisation Group | In English | → Standardization → Engineering, technology |
| THP | Thrust Horsepower | In English | → Mechanical engineering → Vehicle engineering |
| THT | Through Hole Technology | In English | → Electronics |
| THT | Thanscheidt HausTechnik | In German | |
| TI | Technologie Industrielle | In French | → Engineering, technology |
| TI | Tecnoloxías da información = IT | Information Technology | In English = IT | Informationstechnik | In German = IT | Inligtingstegnologie | In Afrikaans = TI | Tecnologia da Informação | In Portuguese |
In Galician | → Computer science → Telecommunications |
| TI | Tecnologia da Informação = IT (look above) |
In Portuguese | → Computer science → Telecommunications |
| TIB | Technische Informationsbibliothek | In German | → Libraries |
| TIC | Tecnologías de la Información y la Comunicación = IKT | Informations- und Kommunikationstechnologie | In German = TIC | Technologies de l'Information et de la Communication | In French = ICT | Information and Communications Technology | In English = IKT | Informations- og kommunikationsteknologi | In Danish = IKT | Inligtings- en kommunikasietegnologie | In Afrikaans = ICT | Informatie- en Communicatietechnologie | In Dutch = TMK | Teknologi Maklumat dan Komunikasi | In Malay |
In Spanish | → Computer science → Telecommunications |
| TIC | Technologies de l'Information et de la Communication = IKT, ICT, TMK (look above) |
In French | → Computer science → Telecommunications |
| TICE | Traité d'Interdiction Complète des Essais nucléaires | In French | → International relations → Military engineering → Nuclear technology |
| TID | Telefónica Investigación y Desarrollo | In Spanish | → Networks, communication → Telecommunications |
| TIE | Technologies et Innovation pour l’Entreprise | In French | → Engineering, technology |
| TIFDL | TOPEX Interfacility Data Link | In English | → Spaceflight engineering, astronautics |
| TIFS | Total In-Flight Simulator | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| TIG | Time of/until Ignition | In English | → Spaceflight engineering, astronautics |
| TIG | Technologie-Impuls-Gesellschaft | In German | |
| TIH | Thrombopénie Immunologique à l'Héparine | In French | → Immunology and allergy → Pathology |
| TILAK | Tiroler Landeskrankenanstalten (www.tilak.at) | In English | → Medicine |
| TIM | Technologie- und Innovationsmanagement | In German | → Engineering, technology |
| TIMC | Transactions of the Institute of Measurement and Control | In English | → Serial publications, periodicals |
| TIO | Target Insertion Orbit | In English | → Spaceflight engineering, astronautics |
| TIP | Technical Integration Panel | In English | |
| TIP | Thrust Inlet Pressure | In English | → Vehicle engineering |
| TIPHON | Telecommunications and Internet Protocol Harmonization Over Networks | In English | → Telecommunications |
| TIPP | Taxe Intérieure sur les Produits Pétroliers | In French | → Taxes, duties → 665 → Transport and postal services |
| TIPS | Thruster Instability Protection System | In English | → Spaceflight engineering, astronautics |
| TIR | Terminal Imaging Radar | In English | → Geodesy, cartography → Spaceflight engineering, astronautics |
| TIROS | Television Infrared Observation Satellite | In English | → Spaceflight engineering, astronautics → Telecommunications |
| TIRU | Traitement Industriel des Résidus Urbains | In French | → Environmental technology, water supply, waste management |
| TISI | Technologies de l’Information appliquées aux Systèmes Industriels | In French | → Computer-based techniques → Engineering, technology |
| TISPAN | Telecoms & Internet converged Services & Protocols for Advanced Networks | In English | → Telecommunications |
| TJAu | Telecommunication Journal of Australia | In English | → Serial publications, periodicals → Telecommunications |
| TK | Tehnilised Komiteed | In Estonian | → Organizations and associations → Engineering, technology |
| TKSC | Tsukuba Space Center | In English | → Astronomy → Spaceflight engineering, astronautics |
| TL | Télé Liban | In French | → Telecommunications |
| TL | Transports Lausannois | In French | → Transport and postal services |
| TL | Tramways Lausannois | In French | → Transport and postal services |
| TLD | Top Level Domain | In English | → Networks, communication → Telecommunications |
| TLF | Télévision de tous les Franciliens | In French | → Telecommunications |
| TLI | Translunar Injection | In English | → Spaceflight engineering, astronautics |
| TLL | Télévision Locale Loire | In French | → Telecommunications |
| TLL | Thüringer Landesanstalt für Landwirtschaft | In German | → Agricultural sciences |
| TLL | Temasek Life Sciences Laboratory | In English | → Research institutes → Biological sciences → Biotechnology → Medicine |
| TLO | Technology Licensing Organization | In English | → Organizations and associations → Engineering, technology |
| TLV | Transporter-Loader Vehicle | In English | → Vehicle engineering |
| TLV | Target Launch Vehicle | In English | → Spaceflight engineering, astronautics |
| TM | Torque Motor | In English | → Vehicle engineering |
| TM | Transmission & Multiplexing | In English | → Telecommunications |
| TM | Transplantation Médullaire | In French | → Surgery, orthopaedics, ophthalmology |
| TMA | Trans Mediterranean Airways | In English | → Aeronautics, aircraft → Transport and postal services |
| TMA | Thrombotic Microangiopathy | In English | → Blood and circulatory system → Pathology |
| TMA | Tissue Micro-Array | In English | → Biotechnology |
| TMB | Transportes Metropolitanos de Barcelona | In Spanish | → Transport and postal services |
| TMB | Transportation Management Bulletin | In English | → Transport and postal services |
| TMD | Transports de Marchandises Dangereuses | In French | → Transport and postal services |
| TMD | Transport de Matières Dangereuses | In French | → Transport and postal services → Chemicals |