| Acronym | Sense | Language | Topics |
|---|---|---|---|
| OAS | Office Automation System | In English | |
| OCA | Ouest Convoyeur et Automatisme | In French | |
| OCG | Organe de Coupure Général | In French | → Energy economics → Electrical engineering |
| OCRD | Opérateur Commun du Réseau de Distribution | In French | → Energy economics → Electrical engineering |
| OEB | Ordre d'Exécution de Branchement | In French | → Energy economics → Electrical engineering |
| ÖEK | Österreichisches Elektrotechnisches Komitee | In German | → Standardization → Electrical engineering → Austria |
| OEW | Oberschwäbische Elektrizitätswerke | In German | → Electrical engineering |
| OFHC | Oxygen-Free High Conductivity | In English | → Electronics |
| OGK | Optovaya Giéniérirouyouchtchaya Kompaniya = ОГК | Оптовая генерирующая компания | In Russian |
In Russian | → Energy economics → Electrical engineering |
| OICA | Organisation Internationale des Constructeurs d'Automobiles (http://oica.net) | In French | → Organizations and associations → Automobile manufacturing |
| OIEA | Organismo Internacional de Energía Atómica (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 = 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 = UAEA | Uluslararası Atom Enerji Ajansı | In Turkish = IAEA | สำนักงานพลังงานปรมาณูระหว่างประเทศ | In Thai = EANA | Energia Atomikoaren Nazioarteko Agentzia | In Basque |
In Spanish | → International relations → Energy economics → Nuclear technology |
| OMEC | Organic Materials for Electronics Consortium | In English | → Chemistry → Electronics |
| OMEGA | Outil pour les Mutuelles des Électriciens et GAziers | In French | → Software → Insurance → Energy economics → Electrical engineering |
| OMT | Organe de Manœuvre Télécommandé | In French | → Telecommunications |
| ONE | Office National d'Électricité (www.one.org.ma) | In French | → Central administration → Electrical engineering → Morocco |
| OPALE | Outil Probabiliste des ALimentations Électriques | In French | → Software → Electrical engineering |
| OPEN | Organisation de Producteurs d'Énergie Nucléaire | In French | → Organizations and associations → Energy economics → Nuclear technology |
| OPERA | Observatoire PErmanent de la RAdioactivité | In French | → Organizations and associations → Nuclear technology |
| OPRI | Office de Protection contre les Rayonnements Ionisants (www.opri.fr) | In French | → Organizations and associations → Nuclear technology |
| ORE | Opérateur de Réseau Électricité | In French | → Energy economics → Electrical engineering |
| ORM | Operational Reactivity Margin | In English | → 53912 → Nuclear technology |
| OSART | Operational Safety Assessment Review Team | In English | → Nuclear technology |
| OSGE | Observatoire Statistique du Groupe EDF | In French | → Energy economics → Electrical engineering |
| ÖVE | Österreichischer Verband für Elektrotechnik (www.ove.at) | In German | → Organizations and associations → Electronics → Austria |
| ÖVK | Österreichischer Verein für Kraftfahrzeugtechnik (www.övk.at) | In German | → Organizations and associations → Austria |
| P3S | Power Systems Supports and Services | In English | → Energy economics → Electrical engineering |
| PAC | Pile à combustible | In French | → Energy economics → Electrical engineering |
| PACE | Power and Control Electronics | In English | → Electronics |
| PAF | Payload Attach Fitting | In English | → Astronautics |
| PAI | Produit d'Activation des Impuretés (de la céramique) | In French | → Chemistry → Nuclear technology |
| PAL | Programmable Array Logic | In English | → Computer hardware → Electronics |
| PANTER | Poste Auxiliaire de Numérisation, de Tracé et d'Études de Réseaux | In French | → Computer-based techniques → Energy economics → Electrical engineering |
| PAS | Produit d'Activation des Structures | In French | → Chemistry → Nuclear technology |
| PASA | Permutateur Automatique de Sources d'Alimentation | In French | → Electrical engineering |
| PASTISS | Professional Analysis Software Tool for Inflatable Space Structures | In English | → Software |
| PBD | Payload Bay Door | In English | → Astronautics |
| PBDM | Payload Bay Door Mechanism | In English | → Astronautics |
| PC | Printed Circuit | In English | → Electronics |
| PCA | Power Conditioning Assembly | In English | → Electrical engineering |
| PCA | Power Controller Assembly | In English | → Electrical engineering |
| PCB | Power Circuit Breaker | In English | → Electrical engineering |
| PCB | Power Control Box | In English | → Electrical engineering |
| PCB | Printed Circuit Board | In English | → Electronics |
| PCCN | Palier de Protection et de Contrôle Commande Numérique | In French | → Electrical engineering |
| PCE | Power Conditioning Electronics | In English | → Electrical engineering → Electronics |
| PCE | Power Conditioning Equipment | In English | → Electrical engineering |
| PCI-E | Peripheral Component Interconnect Express | In English | → Computer science → Electronics |
| PCL | Power Control List | In English | → Electrical engineering |
| PCM | Photoelectric Cell Module | In English | → Energy economics → Electrical engineering |
| PCM | Power Control Mission | In English | → Electrical engineering |
| PCME | Physique, Chimie, Mécanique, Électronique | In French | → Higher education, universities → Physics → Chemistry → Engineering, technology |
| PCP | Power Control Panel | In English | → Electrical engineering |
| PCR | Power Change Request | In English | → Quality management → Electrical engineering |
| PCRP | Poste Central de Regroupement de Postes | In French | → Electrical engineering → France |
| PCS | Power Conversion System | In English | → Energy economics → Electrical engineering |
| PDB | Power Distribution Box | In English | → Energy economics → Electrical engineering |
| PDC | Power Distribution Control | In English | → Electrical engineering |
| PDE | Producteur Distributeur d'Électricité | In French | → Energy economics → Electrical engineering |
| PDU | Pressure Distribution Unit | In English | |
| PEA | Payload Electronics Assembly | In English | → Electronics → Astronautics |
| PEC | Parallel Earth Conductor | In English | → Electrical engineering |
| PEC | Protective Earth Conductor | In English | → Electrical engineering |
| PEM | Payload Electronics Module | In English | → Electronics → Astronautics |
| PEMFC | Polymer Electrolyte Membrane Fuel Cell | In English | → Vehicle engineering → Electrical engineering → Plastic industry |
| PENCE | Promouvoir Ensemble le Nouveau Confort Électrique | In French | → Electrical engineering |
| PERG | Programme d'Électrification Rurale Global | In French | → Electrical engineering → Regional planning |
| PES | Photoelectric Scanner | In English | → Electronics → Graphic industries, printing, publishing |
| PET | Protective Earth Terminal | In English | → Electrical engineering |
| PFC | Power-Factor-Corrected | In English | → Electrical engineering |
| PG | Power Generation | In English | → Energy economics → Electrical engineering |
| PGA | Power Generating Assembly | In English | → Energy economics → Electrical engineering |
| PGA | Programmable Gain Amplifier | In English | → Electronics |
| PGD&CS | Power Generation, Distribution, and Control Subsystem | In English | → Energy economics → Electrical engineering |
| PGEM | Provinciale Gelderse Electriciteits Maatschappij | In Dutch | → Organizations and associations → Sport, physical exercises → Electrical engineering |
| PGS | Power Generation System | In English | → Energy economics → Electrical engineering |
| PGU | Power Generating Unit | In English | → Electrical engineering |
| PhiJR | Philips Journal Research | In English | → Serial publications, periodicals → Electronics |
| PHILEAS | Packaging Hermétique Intégré fiabLE Avancé sur Silicium | In English | → Electronics → Astronautics |
| PhiRR | Philips Research Reports | In English | → Serial publications, periodicals → Electronics |
| PhiTR | Philips Technical Review | In English | → Serial publications, periodicals → Electronics |
| PHMC | Probe Heater Motor Controller | In English | → Vehicle engineering |
| PHWR | Pressure Vessel Heavy Water Reactor | In English | → Nuclear technology |
| PIC | Pyrotechnic Initiator Circuit | In English | → Electrical engineering |
| PIR | Plate-forme Individuelle Roulante | In French | → Construction |
| PIRL | Plate-forme Individuelle Roulante Légère | In French | → Construction |
| PIV | Peak Inverse Voltage | In English | → Electrical engineering |
| PKM | Perigee Kick Motor | In English | → Vehicle engineering |
| PL | Power Level | In English | → Energy economics → Electrical engineering |
| PLA | Programmable Logic Array | In English | → Computer hardware → Electronics |
| PLAGE | Plattform gegen Atomgefahren | In German | → Organizations and associations → Nuclear technology → Military engineering |
| PLC | Programmable Logic Controller | In English | → Electronics |
| PLC | Power Line Communication | In English | → Electrical engineering → Telecommunications |
| PLD | Programmable Logic Device | In English | → Computer hardware → Electronics |
| PLL | Phase Lock Loop | In English | → Electronics |
| PM | Pointe Mobile | In French | → Electrical engineering |
| PMAD | Power Management And Distribution | In English | → Energy economics → Electrical engineering |
| PMC | Plutonia-Molybdenum Cermet | In English | → Energy economics → Nuclear technology |
| PMD | Power Management and Distribution | In English | → Electrical engineering → Energy economics |
| PMF | Pression Moyenne de Frottement | In French | |
| PMP | Premodulation Processor | In English | → Electronics |
| PMPL | Preferred Mechanical Parts List | In English | → Maintenance and logistics → Electrical engineering |
| PMS | Payload Mounting Structure | In English | → Astronautics |
| PMS | Power Management System | In English | → Energy economics → Electrical engineering |
| PNB | Pôle Nucléaire Bourguignon | In French | → Nuclear technology |
| PO | Power On | In English | → Electrical engineering |
| PO | Power Oscillator | In English | → Electrical engineering |
| POAC | Process on a Chip | In English | → Electronics |
| PoE | Power over Ethernet | In English | → Networks, communication → Electrical engineering |
| POGDC | Piston Octogonal à Géométrie Déformable Contrôlée | In French | |
| POI | Power-On/Off Interrupt | In English | → Electrical engineering |
| POID | Power-On/Off Interrupt Delay | In English | → Electrical engineering |
| POP | Preburner Oxidizer Pump | In English | |
| POR | Power-On Reset | In English | → Electrical engineering |
| POV | Peak Operating Voltage | In English | → Electrical engineering |
| PP | Power Plant | In English | → Energy economics → Electrical engineering |
| PP | Premodulation Processor | In English | → Electronics |
| PPA | Power Pitch-Around | In English | → Electrical engineering |
| PPCF | Plasma Physics and Controlled Fusion (www.iop.org/EJ/journal/PPCF) | In English | → Serial publications, periodicals → Plasma physics → Nuclear technology |
| PPD | Power Pitch-Down | In English | → Electrical engineering |
| PPE | Premodulation Processor Equipment | In English | → Electronics |
| PPE | Programme de Principe d'Essais | In French | → Nuclear technology |
| PPEE | Periodica Polytechnica Electrical Engineering | In English | → Serial publications, periodicals → Electrical engineering |
| PPME | Periodica Polytechnica Mechanical Engineering | In English | → Serial publications, periodicals |
| PQE | Progress in Quantum Electronics | In English | → Serial publications, periodicals → Quantum mechanics → Electronics |
| PQFP | Plastic Quad Flat Pack | In English | → Electronics |
| PRE | Power Regulation Equipment | In English | → Electrical engineering |
| PRIIM | Projet de Réalisation et d'Innovation Industrielle de Microsystèmes Hétérogènes | In French | → Electronics |
| PRISMA | Productique et Informatique des Systèmes Manufacturiers | In French | → Computer-based techniques |
| PRM | Payload Retention Mechanism | In English | → Astronautics |
| PROGRESS | Programme for Research on Embedded Systems & Software | In English | → Software → Electronics |
| PS | Power Supply | In English | → Electrical engineering |
| PSA | Power and Servoassembly | In English | → Electrical engineering |
| PSA | Power Servoamplifier | In English | → Electrical engineering |
| PSA | Power Switching Assembly | In English | → Energy economics → Electrical engineering |
| PSCU | Power Supply Control Unit | In English | → Energy economics → Electrical engineering |
| PSD | Power Spectral Density | In English | → Physics → Electrical engineering |
| PSD | Power Systems Division | In English | → Energy economics → Electrical engineering |
| PSDU | Power and Signal Distribution Unit | In English | → Energy economics → Electrical engineering → Telecommunications |
| PSEPR | Pôle Système Électrique Production Régionale | In French | → Electrical engineering |
| PSF | Probability of Stress Failure | In English | |
| PSG | Power Subsystem Group | In English | → Energy economics → Electrical engineering |
| PSI | Programme de Surveillance de l'Irradiation | In French | → Nuclear technology |
| PSIU | Power and Signal Interface Unit | In English | → Energy economics → Electrical engineering → Telecommunications |
| PSL | Pressure Seal | In English | |
| PSPA | Pilotage des Systèmes de Production Automatisée | In French | |
| PSU | Power Switching Unit | In English | → Energy economics → Electrical engineering |
| PSU | Power Supply Unit | In English | → Computer hardware → Electrical engineering |
| PTR | Projektträger Reaktorsicherheitsforschung | In German | → Nuclear technology |
| PU | Power Unit | In English | → Energy economics → Electrical engineering |
| PUC | Poste Urbain Compact | In French | → Electrical engineering |
| PUCE | Programme pour l'Utilisation des Composants Électroniques | In French | → 621038 |
| PVR | Precision Voltage Reference | In English | → Electrical engineering |
| PWA | Printed Wiring Assembly | In English | → Electronics |
| PWB | Printed Wiring Board | In English | → Electronics |
| PWDS | Protected Wire Distribution System | In English | → Electrical engineering |
| PWMD | Printed Wiring Master Drawing | In English | → Electronics |
| PWR | Pressurized Water Reactor = REP | Réacteur à Eau Pressurisée | In French = DWR | Druckwasserreaktor | In German |
In English | → Nuclear technology |
| QAVT | Qualification Acceptance Vibration Test | In English | → Quality management |
| QCM | Quartz Crystal Microbalance | In English | → Electronics |
| QFP | Quad Flat Pack | In English | → Electronics |
| RaEE | Radio and Electronic Engineer | In English | → Serial publications, periodicals → Telecommunications → Electronics |
| RAPID | Revolutionary Avalanche Photodiode Infrared Detector | In English | → Electronics → Tourism |
| RAS | Remontée Aéro-Souterraine | In French | → Energy economics → Electrical engineering |
| RASM | Remote Analog Submultiplexer | In English | → Electrical engineering |
| RBE | Relative Biological Effectiveness | In English | → Pharmacology, toxicology → Nuclear technology |
| RC | Resistance-Capacitance | In English | → Electrical engineering |
| RCB | Remote Circuit Breaker | In English | → Electrical engineering |
| RCC-C | Règles de Conception et de Construction des Assemblages de Combustible des Centrales Nucléaires | In French | → Nuclear technology |
| RCC-E | Règles de Conception et de Construction des Matériels Électriques des Centrales Nucléaires | In French | → Nuclear technology |
| RCC-G | Règles de Conception et de Construction du Génie Civil des Îlots Nucléaires REP | In French | → Nuclear technology |
| RCC-M | Règles de Conception et de Construction des Matériels Mécaniques des Îlots Nucléaires REP | In French | → Nuclear technology |
| RCC-MR | Règles de Conception et de Construction des Matériels Mécaniques des Îlots Nucléaires RNR | In French | → Nuclear technology |
| RCCB | Remote Central Circuit Breaker | In English | → Electrical engineering |
| RCD | Réacteur Complétement Déchargé | In French | → Nuclear technology |
| RCM | Reciprocating Chemical Muscle | In English | → Chemical technology |
| RCO | Radio Comptoir de l'Ouest | In French | → Trade → Electronics |
| RCS | Roux-Combaluzier-Schindler | In French | |
| REB | Réacteur à Eau Bouillante = BWR | Boiling Water Reactor | In English = SWR | Siedewasserreaktor | In German |
In French | → Nuclear technology |
| REC | Regional Electricity Company | In English | → Energy economics → Electrical engineering |
| REDAC | Rockwell Electronic Design Analysis Code | In English | → Electronics |
| REEP | Radio Engineering and Electronic Physics | In English | → Serial publications, periodicals → Telecommunications → Electronics |
| REG | Résistances Électriques et Gazières | In French | → Electrical engineering |
| REP | Réacteur à Eau Pressurisée = PWR, DWR (look above) |
In French | → Nuclear technology |
| RESC | Réacteur à Eau SuperCritique | In French | → Nuclear technology |
| RET | Régie d'Electricité de Thônes | In French | → Electrical engineering |
| RETS | Reconfigurable Electrical Test Stand | In English | → Electrical engineering |
| REU | Remote Electronics Unit | In English | → Electronics |
| RFI | Radio Frequency Interference | In English | → Telecommunications → Electronics |
| RFrM | Revue Francaise de Mécanique | In French | → Serial publications, periodicals → France |
| RFS | Règle Fondamentale de Sûreté | In French | → Nuclear technology |
| RGC | Rénovation Générale de Cuves | In French | |
| RGN | Revue Générale Nucléaire | In French | → Serial publications, periodicals → Nuclear, atomic, and molecular physics → Nuclear technology |
| RIAM | Research Institute for Applied Mechanics | In English | → Research institutes → Mechanics |
| RIC | Resistance, Inductance, and Capacitance | In English | → Physics → Electrical engineering |
| RIIC | Research Institute for Integrated Circuits | In English | → Research institutes → Electronics |
| RJTAM | Russian Journal Theoretical and Applied Mechanics | In English | → Serial publications, periodicals → Mechanics → Russia |
| RLPME | Research Laboratory Precision Machinery Electronics Bulletin | In English | → Serial publications, periodicals → Electronics |
| RMBT | Raccordement Modulaire Basse Tension | In French | → Electrical engineering |
| RMN | Résonance Magnétique Nucléaire = NMR | Nuclear Magnetic Resonance | In English = RMN | Ressonància Magnètica Nuclear | In Catalan = RMN | Risonanza Magnetica Nucleare | In Italian = תמ"ג | תהודה מגנטית גרעינית | In Hebrew = ЯМР | Я́дерного магни́тного резона́нса | In Russian = НМР | Нуклеарна магнетна резонанција | In Serbian |
In French | → Medicine → Nuclear, atomic, and molecular physics → Nuclear technology |
| RMN | Ressonància Magnètica Nuclear = NMR, תמ"ג, ЯМР, НМР (look above) |
In Catalan | → Medicine → Nuclear, atomic, and molecular physics → Nuclear technology |