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| Acronym | Sense | Language | Topics |
|---|---|---|---|
| OPR | Orbiter Payload Recorder | In English | → Astronautics |
| OPR | Oxygen Pressure Regulator | In English | |
| OPRI | Office de Protection contre les Rayonnements Ionisants (www.opri.fr) | In French | → Organizations and associations → Nuclear technology |
| OPRV | Oxygen Pressure Relief Valve | In English | |
| OPS | Operational Sequence | In English | → Management |
| OPS | Orbiter Project Schedule | In English | → Astronautics |
| OPS | Oxygen Purge System | In English | |
| OPS | Organización Panamericana de la Salud (www.paho.org) = PAHO | Pan American Health Organization | In English = OPAS | Organização Pan-Americana da Saúde | In Portuguese |
In Spanish | → Organizations and associations → International relations → Medicine |
| OPSA | OSSTMM Professional Security Analyst | In English | → Computer science |
| OpSCN | Optical Sciences Center Newsletter | In English | → Serial publications, periodicals → Optics |
| OPSDB | Operations Data Base | In English | → Data |
| OPSDBA | Operations Data Base Administrator | In English | → Data → Management |
| OPSE | OSSTMM Professional Security Expert | In English | → Computer science |
| OPSIS | Observation et Prospective sur la Société de l'Information et ses Services | In French | → Computer science → Telecommunications |
| OPSS | Orbital Propellant Storage Subsystem | In English | → Astronautics |
| OPST | OSSTMM Professional Security Tester | In English | → Computer science |
| OPT | Operational Pressure Transducer | In English | |
| OPT | Opérations de Patrimoine et Trésorerie | In French | → Accounting |
| OPT | Opération de Patrimoine et Trésorerie | In French | → Finance → Accounting |
| OPTB | Operational Program Time Base | In English | |
| OptCo | Optics Communications | In English | → Serial publications, periodicals → Optics → Telecommunications |
| OptEn | Optical Engineering | In English | → Serial publications, periodicals → Optics |
| OptFT | Optical Fiber Technology | In English | → Serial publications, periodicals → Optics → Telecommunications |
| OPTI | Observatorio de Prospectiva Tecnológica Industrial | In Spanish | → Engineering, technology |
| OPTILE | Organisation Professionnelle des Transports d'Île-de-France | In French | → Organizations and associations → Transport and postal services → France |
| OptL | Optics Letters | In English | → Serial publications, periodicals → Optics |
| OptLE | Optics and Lasers in Engineering | In English | → Serial publications, periodicals → Optics → Electromagnetism |
| OptLT | Optics Laser Technology | In English | → Serial publications, periodicals → Optics → Electromagnetism |
| OptMa | Optical Materials | In English | → Serial publications, periodicals → Optics → Materials science |
| OptN | Optics News | In English | → Serial publications, periodicals → Optics |
| OptPE | Optical Physics and Engineering | In English | → Serial publications, periodicals → Optics |
| OptPN | Optics & Photonics News | In English | → Serial publications, periodicals → Optics → Electromagnetism |
| OptQE | Optical Quantum Electronics | In English | → Serial publications, periodicals → Quantum mechanics → Optics → Engineering, technology |
| OptRv | Optical Review | In English | → Serial publications, periodicals → Optics |
| OptSp | Optics and Spectroscopy | In English | → Serial publications, periodicals → Optics → Electromagnetism |
| OPWC | Organisation for the Prohibition of Chemical Weapons (www.opcw.org) = OIAC | Organisation pour l'Interdiction des Armes Chimiques | In French |
In English | → Organizations and associations → International relations → Military engineering |
| OPWS | Orbital Payload Work Station | In English | → Astronautics |
| OQE | Optical and Quantum Electronics | In English | → Serial publications, periodicals → Quantum mechanics → Optics → Engineering, technology |
| OQL | Object Query Language | In English | → Programming languages → Data |
| OQLF | Office Québécois de la Langue Française (www.oqlf.gouv.qc.ca) | In French | → Organizations and associations → Dictionaries → Linguistics → Canada |
| OR | Organized Research | In English | |
| OR | Organisme de Rattachement | In French | |
| ORA | Operational Requirements Analysis | In English | → Management |
| ORA | Organisation de Résistance de l'Armée | In French | → Military affairs → History |
| ORA | Organisation Révolutionnaire Anarchiste | In French | → Organizations and associations → Anarchist organizations |
| ORA | Opérateur Régional des Achats | In French | → 34745 |
| ORAC | Oxygen Radical Absorbance Capacity | In English | → Biochemistry, biophysics → Nutrition |
| ORAM | Output Random Access Memory | In English | → Memories |
| ORANO | Opérateur Régional d'Achats Nord-Ouest | In French | → 34745 |
| ORAP | Organisation Associative du Parallélisme | In French | → Organizations and associations → Computer science |
| ORB | Object Request Broker | In English | → Networks, communication |
| ORB | Operations Review Board | In English | → Management |
| ORC | Optical Character Recognition = ROC | Reconnaissance Optique de Caractères | In French |
In English | → Writing systems → Computer-based techniques |
| ORC | Operations Request Card | In English | |
| ORCADE | Outil de Reporting, de Consolidation et d'Aide à la DÉcision | In French | → Software → Management |
| ORCHIDEE | ORdonnancement des CHaînes Informatiques Dirigées par les Événements et les Enchaînements | In French | → Software |
| ORCHIS | Oak Ridge Computerized Hierarchical Information System | In English | → Computer science → Knowledge management |
| ORCUS | Orbital Recording Capability and Update System | In English | → Astronautics |
| ORD | Operational Readiness Data | In English | |
| ORD | Operational Ready Data | In English | |
| ORD | Operations Requirements Document | In English | → Management |
| ORD | Orbital Requirements Document | In English | → Astronautics |
| ORD | Office of Rare Diseases (http://rarediseases.info.nih.gov) | In English | → 345 → Pathology |
| ORDA | Oficiul Român pentru Drepturile de Autor | In Romanian | → Law, jurisprudence → Public administration, government |
| ORDBMS | Object-Relational Database Management System | In English | → Data |
| ORDI | Ontology Representation and Data Integration | In English | → Software |
| ORE | Observatoire de Recherche en Environnement | In French | → Environmental protection → Threats to the environment |
| ORE | Output Request Element | In English | |
| ORE | Opérateur de Réseau Électricité | In French | → Energy economics → Electrical engineering |
| OREF | Observatoire Régional de l'Emploi et de la Formation | In French | → Organizations and associations → Labour, labour economics → Education |
| OREM | Officier de Renseignement d'État-Major | In French | → Military affairs |
| ORF | Observer Research Foundation | In English | → Foundations |
| ORF | Österreichischer Rundfunk (http://orf.at) | In German | → Telecommunications → Austria |
| ORFEUS | Observatories and Research Facilities for EUropean Seismology (http://orfeus.knmi.nl) | In English | → Research institutes → Seismology, earthquakes → Netherlands |
| ÖRG | Österreichische Röntgengesellschaft (www.oerg.at) | In German | → Organizations and associations → Medicine → Austria |
| ORG | Opérateur de Réseau Gaz | In French | → Energy economics |
| OrGeo | Organic Geochemistry | In English | → Serial publications, periodicals → Geochemistry |
| ORGÉV | Omnium de Recherche sur la Génétique du Vieillissement | In French | → Biotechnology |
| ORGM | Office National de Recherche Géologique et Minière | In French | |
| ORGT | Officier Renseignement de Groupement Tactique | In French | → Military affairs |
| ORGUE | Outils de Réorganisation de la Gestion Unifiée des Entités | In French | → Software |
| ORI | Operational Readiness Inspection | In English | → Management |
| ORI | Ocean Research Institute (www.ori.u-tokyo.ac.jp) | In English | → Research institutes → Marine research, oceanography → Japan |
| ORIC | ORganisation Informatique Comptable | In French | → Computer science → Accounting |
| ORIENT | Oriental Research Infrastructure to European Networks | In English | → Research policy → International relations |
| ORIS | Office of Research and Information Systems | In English | → Knowledge management |
| ÖRK | Österreichische Rektorenkonferenz (www.reko.ac.at) | In German | → Organizations and associations → Higher education, universities → Austria |
| ORLA | Optimum Repair Level Analysis | In English | → Maintenance and logistics |
| OrLi | Origins of Life | In English | → Serial publications, periodicals → Biological sciences |
| ORM | Operational Reactivity Margin | In English | → 53912 → Nuclear technology |
| ORM | Opérateur de Réseau Mixte | In French | |
| ORM | Observatoire Régional des Métiers | In French | → Organizations and associations → Labour, labour economics |
| ORMP | Office Rwandais des Marchés Publics | In French | → Central administration |
| OrNav | Ortung und Navigation | In German | → Serial publications, periodicals → Geodesy, cartography |
| ÖROK | Österreichische Raumordnungskonferenz (www.oerok.gv.at) | In German | → Central administration → Regional planning → Austria |
| ORP | OFS Retransmission Processor | In English | |
| ORP | Optional Retirement Program | In English | → Labour, labour economics |
| ORPCF | Organisation pour la Reconstruction du Parti Communiste de France | In French | → Communist parties → France |
| ÖRPE | Österreichische Referenzzentrum zur Erfassung und Dokumentation von menschlichen Prionenerkrankungen | In German | → Documentation → Pathology → Austria |
| ORPHEM | Organisation Régionale des Pharmaciens Hospitaliers de l'Est Méditerranéen | In French | → Organizations and associations → Pharmacology, toxicology |
| ORR | Operational Readiness Review | In English | → Management |
| ORR | Operations Requirements Review | In English | → Management |
| ORR | Ordre de Réduction de Recettes | In French | → Accounting |
| ORRCA | Ontario Research Centre for Computer Algebra (www.orcca.on.ca) | In English | → Research institutes → Algebra → Computer science → Canada |
| ORROE | Occasional Reports of the Royal Observatory Edinburgh | In English | → Serial publications, periodicals → Astronomy |
| ORS | Outer Root Sheath | In English | → Anatomy |
| ORS | Österreichische Rundfunksender (www.ors.at) | In German | → Telecommunications → Austria |
| ORS | Orbital Refueling System | In English | → Astronautics |
| ORS | Orbital Reservicing System | In English | → Astronautics |
| ORS | Orbital Resupply System | In English | → Astronautics |
| ORSDI | Oak Ridge Selective Dissemination of Information | In English | → Computer science → Knowledge management |
| ORSE | Observatoire sur la Responsabilité Sociétale des Entreprises | In French | → Ethics → Social sciences |
| ORSEC | Organisation de la Réponse de SEcurité Civile | In French | → Central administration → France |
| ORT | Operational Readiness Test | In English | → Management |
| ORT | Orbit Readiness Test | In English | → Astronautics |
| ORT | Organisation Reconstruction Travail | In French | → History |
| ORTA | Organisme de Ràdio i Televisió d'Andorra | In Catalan | → Telecommunications → Andorra |
| ORTAS | Organisme de la Radio-Télévision Arabe Syrienne | In French | → Telecommunications |
| ORTÜ | Orta Doğu Teknik Üniversitesi | In Turkish | → Higher education, universities |
| ORU | Orbital Replaceable Unit | In English | → Astronautics |
| ORU | Orbital Replacement Unit | In English | → Astronautics |
| ORU | Opération de Rénovation Urbaine | In French | → Accommodation → Architecture |
| ÖRV | Österreichischer Rodel-Verband (www.rodel-austria.at) | In German | → Organizations and associations → Austria |
| ORV | Orbital Research Vehicle | In English | → Astronautics |
| OS | Orientalia Suecana | In Latin | → Serial publications, periodicals → Linguistics |
| OS | On-orbit Station | In English | → Astronautics |
| OS | Operating Software | In English | → Software |
| OS | Operating System | In English | → Operating systems |
| OS | Orbiter CEI Specification | In English | → Astronautics |
| OS | Operazione Sviluppo | In Italian | → Organizations and associations → Development |
| OS3B | Open Software Blanc Bleu Belge | In French | → Organizations and associations → Software → Belgium |
| OSA | Oklahoma Sociological Association | In English | → Associations → Sociology → United States |
| OSA | Operational Support Area | In English | |
| OSA | Ordered-Subset Analysis | In English | |
| OSA | Ordo Sancti Augustini | In Latin | → Organizations and associations → Christianity |
| OSA | Operatori Spettacolo Associati | In Italian | |
| OSA | Operational Support Airlift | In English | |
| OSA | Officier Supérieur Adjoint | In French | → Military affairs |
| OSAJ | Optical Society of America Journal | In English | → Serial publications, periodicals → Optics → United States |
| OSAJI | Optical Society of America Journal - Optics and Image Science | In English | → Serial publications, periodicals → Optics → United States |
| OSALL | Organisation of South African Law Libraries | In English | → Organizations and associations → Libraries → Law, jurisprudence → Africa |
| OSART | Operational Safety Assessment Review Team | In English | → Nuclear technology |
| OSB | Oberste Schifffahrtsbehörde | In German | |
| OSB | Order of Saint Benedict | In English | → Roman catholic church |
| OSB | Ordo Sancti Benedicti | In Latin | → Organizations and associations → Christianity |
| OSB | Orientated Strand Board | In English | → Timber and woodworking industry |
| OSC | Orbital Sciences Corporation | In English | → Astronautics |
| OSC | Order of Saint Camillus | In English | → Roman catholic church |
| OSC | Operations Support Center | In English | |
| OSC | Operations Support Contract | In English | |
| OSC | Optical Signatures Code | In English | |
| OSC | Orientations Stratégiques Communautaires | In French | → European Union |
| OSC | Ookmeer Schinkelhaven Combinatie | In Dutch | → Organizations and associations → Sport, physical exercises |
| OSC | Olstse Sport Club | In Dutch | → Organizations and associations → Sport, physical exercises |
| OSC | Oosterhoutse Sport Club | In Dutch | → Organizations and associations → Sport, physical exercises |
| OSC | Orthense Sport Club | In Dutch | → Organizations and associations → Sport, physical exercises |
| OSCAR | Orbiting Satellite Carrying Amateur Radio | In English | → Astronautics → Telecommunications |
| OsCar | Osteoarthritis and Cartilage | In English | → Serial publications, periodicals → Medicine |
| OSCAR | Outils de Services, Conseils et Assistance Rapide | In French | → Computer science |
| OSCE | Organization for Security and Cooperation in Europe (www.osce.org) = OSCE | Organisation pour la Sécurité et la Coopération en Europe | In French |
In English | → International relations → Europe |
| OSCE | Organisation pour la Sécurité et la Coopération en Europe (www.osce.org) = (look above) |
In French | → International relations → Europe |
| OSCF | Operations Support Computing Facility | In English | → Computer science |
| OSCI | Organisation des Opérateurs Spécialisés du Commerce International | In French | → Organizations and associations → Trade |
| OSCIP | Organização da Sociedade Civil de Interesse Público | In Portuguese | → Organizations and associations |
| OSCN | Orbiter Specification Change Notice | In English | → Astronautics |
| OSCR | Orbiter Software Change Request | In English | → Software → Astronautics |
| OSCRS | Orbital Spacecraft Consumables Resupply System | In English | → Maintenance and logistics → Astronautics |
| OSD | Office of the Secretary of Defense | In English | → Central administration → Military affairs |
| OSDH | Orbiter System Definition Handbook | In English | → Astronautics |
| OSDL | Open Source Development Labs | In English | → Software |
| OSDL | Open Source Development Lab | In English | → Software |
| OSDO | Ons Samenspel Doet Overwinnen | In Dutch | → Organizations and associations → Sport, physical exercises |
| OSDPE | Office of the Secretary of Defense Program Element | In English | → Central administration → Military affairs |
| OSE | Open System Environment | In English | → Computer science |
| OSE | Oeuvre de Secours aux Enfants | In French | → Organizations and associations → Politics |
| OSE | Operating Support Equipment | In English | |
| OSE | Orbital Support Equipment | In English | → Astronautics |
| OSERA | Ohio Scientific Education & Research Association (www.osera.org) | In English | → Associations → Education → Research policy → United States |
| OSERS | Office of Special Education and Rehabilitative Services | In English | → Social welfare → Education |
| OSF | Open Software Foundation | In English | → Foundations → Software |
| OSF | Orbiter Simulation Facility | In English | → Astronautics |
| ÖSFK | Österreichisches Studienzentrum für Frieden und Konfliktlösung (www.aspr.ac.at) | In German | → Research institutes → Polemology → Austria |
| ÖSFO | Ökosoziales Forum Österreich (www.oesfo.at) | In German | → Organizations and associations → 5023 → Social sciences → Austria |
| ÖSG | Österreichische Schmerzgesellschaft (www.oesg.at) | In German | → Organizations and associations → Pathology → Austria |
| ÖSG | Österreichischer Strukturplan Gesundheit | In German | → Medicine → Austria |
| OSG | Openbare Scholengemeenschap | In Dutch | → Education |
| OSGE | Observatoire Statistique du Groupe EDF | In French | → Energy economics → Electrical engineering |
| OSGi | Open Services Gateway initiative (www.osgi.org) | In English | → Organizations and associations → Software |
| OSH | Oblates of the Sacred Heart | In English | → Christianity |
| OSHA | Occupational Safety and Health Administration (www.osha.gov) | In English | → Central administration → Accidents, risks, safety → Labour, labour economics |
| OSHA | Occupational Safety and Health Act | In English | → Accidents, risks, safety → Labour, labour economics → Medicine |
| OSHA | Operating and Support Hazard Analysis | In English | |
| OSI | Open Systems Interconnection | In English | |
| OSI | Otto-Suhr-Institut für Politikwissenschaft | In German | → Politics |
| OSI | Open Source Initiative | In English | → Software |
| OSI | Open Society Institute | In English | → Politics → Fundamental rights |
| OSI | Office of Strategic Influence | In English | |
| OSI | Ordnance Survey Ireland | In English | → Republic of Ireland |
| OSI | Österreichisches Ost- und Südosteuropa-Institut (www.osi.ac.at) | In German | → Research institutes → Area studies → Austria |
| OSI | Onze Sport Inspireert | In Dutch | → Organizations and associations → Sport, physical exercises |