| SMS | Stationary Manipulator System | In English | |
| SMS | System Mechanical Schematic | In English | |
| SMT | Surface Mount Technology | In English | → Electronics |
| SNA | Sous-marin Nucléraire d'Attaque | In French | → Nuclear technology → Military engineering |
| SNAP | Space Nuclear Auxiliary Power | In English | → Nuclear technology → Spaceflight engineering, astronautics |
| SNC | Société Nucléaire Canadienne (www.cns-snc.ca) | In French | → Organizations and associations → Nuclear, atomic, and molecular physics → Nuclear technology |
| SNET | Société Nationale d’Électricité et de Thermique | In French | → Energy economics → Electrical engineering |
| SNLE | Sous-marin Nucléaire Lanceur d'Engins | In French | → Nuclear technology → Military engineering |
| SNPO | Space Nuclear Propulsion Office | In English | → Nuclear technology → Spaceflight engineering, astronautics |
| SNSO | Space Nuclear Systems Office | In English | → Nuclear technology → Spaceflight engineering, astronautics |
| SODETREL | Société pour le Développement des Transports Électriques | In French | → Electrical engineering → Vehicle engineering → Transport and postal services |
| SONEL | Société Nationale d’ÉLectricité | In French | → Electrical engineering |
| SOPC | System On a Programmable Chip | In English | → Hardware → Electronics |
| SOS | Silicon On Sapphire | In English | → Electronics |
| SP | Signal Processor | In English | → Electronics |
| SPA | Servopower Assembly | In English | |
| SPA | Signal Processor Assembly | In English | → Hardware → Electronics → Telecommunications |
| SPA | Servopower Amplifier | In English | |
| SPE | Société de Production d’Électricité | In French | → Electrical engineering |
| SPEE | Special-Purpose End Effector | In English | → Electronics |
| SPMS | Special-Purpose Manipulator System | In English | |
| SPOM | Self Programmable One-chip Microcomputer | In English | → Hardware → Electronics → Telecommunications |
| SPP | Signal Preprocessor | In English | → Electronics → Telecommunications |
| SPT | Stationnary Plasma Thruster | In English | → Electrical engineering → Spaceflight engineering, astronautics |
| SPTMI | Société Phocéenne Marine Industrielle (www.sptmi.com) | In French | → 6295 |
| SQFP | Shrink Quad Flat Pack | In English | → Electronics |
| SSPDB | Subsystem Power Distribution Box | In English | → Electrical engineering |
| SSPTF | Santa Susana Propulsion Test Facility | In English | |
| SSTP | Shielded and Shielded Twisted Pair | In English | → Electrical engineering |
| StCMA | Studii şi Cercetări de Mecanică Aplicată | In Romanian | → Serial publications, periodicals |
| STEP | Solving the E-waste Problem | In English | → Electronics → Environmental technology, water supply, waste management |
| STERIA | SociéTÉ de Réalisations en Informatique et Automatisme | In French | → Computer-based techniques |
| STP | Shielded Twisted Pair | In English | → Electrical engineering |
| SuScT | Superconductor Science Technology | In English | → Serial publications, periodicals → Electrical engineering |
| SvPS | Soviet Physics Semiconductors | In English | → Serial publications, periodicals → Electronics |
| SWEB | South Western Electricity Board | In English | → Electrical engineering |
| SWF | Spezial Werkzeugfabrik Feuerbach | In German | → Automobile manufacturing |
| SWIFET | Short-Wave Infrared Field Effect Transistor | In English | → Electronics |
| SWIFET | Switched Field Effect Transistor | In English | → Electronics |
| SWR | Siedewasserreaktor = BWR | Boiling Water Reactor | In English = REB | Réacteur à Eau Bouillante | In French |
In German | → Nuclear technology |
| SYNCOMECS | SYNthesis of Aeronautical COmpliant MEChanical Systems | In English | → Aeronautics, aircraft |
| SZPC | Shandong Zhonghua Power Company | In English | → Electrical engineering |
| TAB | Tape Automated Bonding | In English | → Electronics |
| TAPIR | Transformateur d'Alimentation Provisoire Intégré sur Remorque | In French | → Electrical engineering → Food technology |
| TARTAM | TArif Réglementé Transitoire d'Ajustement du Marché | In French | → Prices → Electrical engineering |
| TBG | Gyro-To-Body Transformation Matrix | In English | |
| TBI | Body Axis-To-Inertial Transformation Matrix | In English | |
| TDR | Time Domain Reflectometer | In English | → Electronics |
| TE | Timing Electronics | In English | → Electronics |
| TEA | Tranche en Arrêt | In French | → Nuclear technology → Electrical engineering |
| TEF | Tranche en Fonctionnement | In French | → Nuclear technology → Electrical engineering |
| TEGI | Tractebel Electricity & Gas International | In English | → Energy economics → Electrical engineering |
| TekEl | Tekhnicheskaia Elektrodinamika = TekEL | Технiчна електродинамiка | In Russian |
In Russian | → Serial publications, periodicals → Electrical engineering |
| TekEL | Технiчна електродинамiка = TekEl (look above) |
In Russian | → Serial publications, periodicals → Electrical engineering |
| TEM | Tranche en Marche | In French | → Nuclear technology → Electrical engineering |
| TEMASOL | Total EDF Maroc Solaire | In French | → Energy economics → Electrical engineering |
| TENERRDIS | Technologies Énergies Nouvelles Énergies Renouvelables Rhône-Alpes, Drôme, Isère, Savoie | In French | → 6219 |
| TEO | Transport Électricité Ouest | In French | → Electrical engineering |
| 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 |
| TFA | Très Faible Activité | In French | → Nuclear technology |
| TFT | Thin Film Transistor | In English | → Electronics |
| ThAFM | Theoretical and Applied Fracture Mechanics | In English | → Serial publications, periodicals |
| THEMIS | Technologies et Modélisation des Infrastructures des Systèmes Électriques | In French | → Electrical engineering |
| THP | Thrust Horsepower | In English | → Vehicle engineering |
| THT | Through Hole Technology | In English | → Electronics |
| TICE | Traité d'Interdiction Complète des Essais nucléaires | In French | → International relations → Military engineering → Nuclear technology |
| TME | Transfer Multisort Electronic | In English | → Electronics |
| TMP | Thermo-Mécanique et Plasticité | In French | → 620 → Chemical technology |
| TNP | Traité de Non Prolifération des armes nucléaires | In French | → International relations → Military engineering → Nuclear technology |
| TNS | Total Network Solutions (www.tns.co.uk) | In English | → Hardware → 6218 → Telecommunications |
| TP | Turbopump | In English | |
| TPA | Turbopump Assembly | In English | |
| TPN | Tarif de Première Nécessité | In French | → Prices → Electrical engineering |
| TPOCP | Turbopump Oxidizer Cavity Purge | In English | |
| TQFP | Thin Quad Flat Pack | In English | → Electronics |
| TTA | Thermomechanical Test Area | In English | |
| TTENP | Transport Électricité Normandie Paris | In French | → Electrical engineering |
| TTL | Transistor-Transistor Logic | In English | → Electronics |
| TURP | Tarifs d'Utilisation des Réseaux Publics | In French | → Electrical engineering |
| UAEA | Uluslararası Atom Enerji Ajansı (www.iaea.org) = IAAE | Internacia Agentejo pri Atom-Energio | In Esperanto = IAEA | International Atomic Energy Agency | In English = AIEA | Agence Internationale de l'Énergie Atomique | In French = AIEA | Agenţia Internaţională pentru Energie Atomică | In Romanian = МААЕ | Международна агенция за атомна енергия | In Bulgarian = AIEA | Agència Internacional de l'Energia Atòmica | In Catalan = MAAE | Mezinárodní agentura pro atomovou energii | In Czech = IAEA | Det Internationale Atomenergiagentur | In Danish = IAEO | Internationale Atomenergieorganisation | In German = OIEA | Organismo Internacional de Energía Atómica | In Spanish = סבא"א | הסוכנות הבינלאומית לאנרגיה אטומית | In Hebrew = IAEA | International Atomenergie Agence | In Letzeburgesh = AIEA | Agenzia Internazionale per l'Energia Atomica | In Italian = IAEA | अंतर्राष्ट्रीय परमाणु ऊर्जा अधिकरण | In Hindi = MAAE | Меѓународна агенција за атомска енергија | In Macedonian = МАГАТЭ | Международное агентство по атомной энергии | In Russian = AIEA | Agência Internacional de Energia Atómica | In Portuguese = MAEA | Międzynarodowa Agencja Energii Atomowej | In Polish = МАГАТЕ | Міжнародне агентство з атомної енергії | In Ukrainian = IAEA | สำนักงานพลังงานปรมาณูระหว่างประเทศ | In Thai = EANA | Energia Atomikoaren Nazioarteko Agentzia | In Basque |
In Turkish | → International relations → Energy economics → Nuclear technology |
| UAPET | Updates in Applied Physics and Electrical Technology | In English | → Serial publications, periodicals → Engineering, technology → Electrical engineering |
| UCPTE | Union pour la Coordination de la Production et du Transport d’Électricité | In French | → Organizations and associations → Electrical engineering |
| UEA | United Energy Associates | In English | → Energy economics → Electrical engineering → Environmental technology, water supply, waste management |
| UES | Unified Energy System = ЕЭС | Единые Энергетические Системы | In Russian |
In English | → Energy economics → Electrical engineering |
| UFE | Union Française de l’Électricité | In French | → Organizations and associations → Electrical engineering |
| UICC | Universal Integrated Circuit Card | In English | → Electronics |
| UKAEA | United Kingdom Atomic Energy Agency | In English | → Public administration, government → Energy economics → Nuclear technology |
| UMIF | Upper Mechanical Integration Frame | In English | |
| UNGG | Uranium Naturel Graphite Gaz | In French | → Nuclear technology |
| UNIPE | Unité Nationale de l’Ingénierie du Parc en Exploitation | In French | → Electrical engineering |
| UNIPEDE | UNion Internationale des Producteurs Et Distributeurs d'Énergie Électrique | In French | → Organizations and associations → Electrical engineering |
| UPS | Uninterruptible Power System | In English | → Electrical engineering |
| USA/RC | Universities Space Automation/Robotics Consortium | In English | → Electrical engineering |
| UTE | Union Technique de l'Électricité et de la Communication | In French | → Organizations and associations → Electrical engineering → Telecommunications |
| UTE | Union Technique de l'Électricite | In French | → Organizations and associations → Electrical engineering |
| UTE | Usina Termelétrica Norte Fluminense (www.utenortefluminense.com.br) | In Portuguese | → Energy economics → Electrical engineering |
| UTP | Unshielded Twisted Pair | In English | → Electrical engineering |
| UVD | Undervoltage Device | In English | → Electrical engineering |
| UVPE | UV/Video Processing Electronics | In English | → Image processing → Electronics |
| V | Volt | In many languages | → Electricity, magnetism, electromagnetism → Electrical engineering |
| VAB | Vertical Assembly Building | In English | |
| VACTL | Vertical Assembly Component Test Laboratory | In English | → Research institutes |
| VAT | Vibroacoustic Test | In English | → Acoustics → Acoustical engineering |
| VATA | Vibroacoustic Test Article | In English | → Acoustics → Acoustical engineering |
| VATF | Vibration and Acoustic Test Facility | In English | → Acoustics → Acoustical engineering |
| VCC | Voltage Change Controller | In English | → Electrical engineering |
| VCO | Voltage Control Operator | In English | → Electrical engineering |
| VCO | Voltage Control Oscillator | In English | → Electrical engineering |
| VCO | Voltage-Controlled Oscillator | In English | → Electrical engineering |
| VCT | Voltage Control Transfer | In English | → Electrical engineering |
| VDE | Verband der Elektrotechnik, Elektronik und Informationstechnik | In German | → Organizations and associations → Electrical engineering → Electronics → Telecommunications |
| VDMA | Verband Deutscher Maschinen- und Anlagenbau | In German | → Organizations and associations |
| VDP | Variable-Delivery Pump | In English | |
| VEEI | Vehicle Electrical Engine Interface | In English | → Electrical engineering → Vehicle engineering |
| VEÖ | Verband der Elektrizitätsunternehmen Österreichs | In German | → Organizations and associations → Electrical engineering |
| VG | Vanne Guillotine | In French | |
| VHD | Véhicule Hybride Diesel/Électrique | In French | → Electrical engineering → Vehicle engineering |
| VHSIC | Very High Speed Integrated Circuit | In English | → Electronics |
| VLSIC | Very Large Scale Integrated Circuit | In English | → Electronics |
| VM | Voltmeter | In English | → Electrical engineering |
| VOGUE | Vers l’Optimisation de la Gestion et de l’Utilisation de l’Énergie | In French | → Energy economics → Electrical engineering |
| VOM | Voltohmmeter | In English | → Electrical engineering |
| VPD | Variable Power Divider | In English | → Energy economics → Electrical engineering |
| VPK | Volts Peak | In English | → Electrical engineering |
| VPP | Virtual Power Plant | In English | → Energy economics → Electrical engineering |
| VR | Voltage Regulator | In English | → Electrical engineering |
| VR | Voltage Relay | In English | → Electrical engineering |
| VSO | Very Stable Oscillator | In English | → Electrical engineering |
| VTVM | Vacuum Tube Voltmeter | In English | → Electrical engineering |
| VVER | Vodo-vodní energetický reaktor = WWER | Wodo-Wodianoj Eniergieticzeskij Rieaktor | In Polish = WWER | Wasser-Wasser-Energie-Reaktor | In German = ВВЕР | Водо-Водяной Энергетический Реак | In Russian |
In Czech | → Nuclear technology |
| W | Watt | In many languages | → Physics → Electrical engineering |
| W&C | Wire and Cable | In English | → Electronics → Telecommunications |
| WANO | World Association of Nuclear Operators | In English | → Associations → Nuclear technology |
| WCSAR | Wisconsin Center for Space Automation and Robotics | In English | → Electronics → Spaceflight engineering, astronautics |
| WEEE | Waste Electrical and Electronic Equipment = DEEE | Déchets des équipements électriques et électroniques | In French |
In English | → Electrical engineering → Electronics → Environmental technology, water supply, waste management |
| WiEn | Wind Energy | In English | → Serial publications, periodicals → Energy economics → 621548 |
| WiEng | Wind Engineering | In English | → Serial publications, periodicals → Energy economics → 621548 |
| WWER | Wasser-Wasser-Energie-Reaktor = VVER, ВВЕР (look above) |
In German | → Nuclear technology |
| WWER | Wodo-Wodianoj Eniergieticzeskij Rieaktor = VVER, ВВЕР (look above) |
In Polish | → Nuclear technology |
| ZaMM | Zeitschrift Angewandte Mathematik und Mechanik | In German | → Serial publications, periodicals → Mathematics |
| ZCS | Zero Current Switch | In English | → Electronics |
| ZECK | Zespół Elektrociepłowni Wrocławskich "Kogeneracja" (www.kogeneracja.com.pl) | In Polish | → Energy economics → Electrical engineering |
| ZECW | Zespół Elektrociepłowni Wybrzeże | In Polish | → Electrical engineering |
| ZeIE | Zeitschrift elektrische Informations- und Energietechnik | In German | → Serial publications, periodicals → Energy economics → Electrical engineering |
| ZVS | Zero Voltage Switch | In English | → Electronics |
| ВВЕР | Водо-Водяной Энергетический Реак = VVER, WWER (look above) |
In Russian | → Nuclear technology |
| ЕЭС | Единые Энергетические Системы = UES (look above) |
In Russian | → Energy economics → Electrical engineering |
| МААЕ | Международна агенция за атомна енергия (www.iaea.org) = UAEA, IAAE, IAEA, AIEA, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, EANA (look above) |
In Bulgarian | → International relations → Energy economics → Nuclear technology |
| МАГАТЕ | Міжнародне агентство з атомної енергії (www.iaea.org) = UAEA, IAAE, IAEA, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, EANA (look above) |
In Ukrainian | → International relations → Energy economics → Nuclear technology |
| МАГАТЭ | Международное агентство по атомной энергии (www.iaea.org) = UAEA, IAAE, IAEA, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, MAEA, МАГАТЕ, EANA (look above) |
In Russian | → International relations → Energy economics → Nuclear technology |
| ОГК | Оптовая генерирующая компания = OGK | Optovaya Giéniérirouyouchtchaya Kompaniya | In Russian |
In Russian | → Energy economics → Electrical engineering |
| ОГК-1 | Оптовая генерирующая компания № 1 (www.ogk1.com) | In Russian | → Energy economics → Electrical engineering |
| ОГК-2 | Оптовая генерирующая компания № 2 (www.ogk2.ru) | In Russian | → Energy economics → Electrical engineering |
| ОГК-3 | Оптовая генерирующая компания № 3 (www.ogk3.ru) | In Russian | → Energy economics → Electrical engineering |
| ОГК-4 | Оптовая генерирующая компания № 4 (www.ogk-4.ru) | In Russian | → Energy economics → Electrical engineering |
| ОГК-5 | Оптовая генерирующая компания № 5 (www.ogk-5.com) | In Russian | → Energy economics → Electrical engineering |
| РБМК | Реактор Большой Мощности Канальный | In Russian | → Nuclear technology → 53912 |
| סבא"א | הסוכנות הבינלאומית לאנרגיה אטומית (www.iaea.org) = UAEA, IAAE, IAEA, AIEA, МААЕ, MAAE, IAEO, OIEA, סבא"א, МАГАТЭ, MAEA, МАГАТЕ, EANA (look above) |
In Hebrew | → International relations → Energy economics → Nuclear technology |