| Acronym | Sense | Language | Topics |
|---|---|---|---|
| OISC | One Instruction Set Computer | In English | → Computer hardware |
| OIT | Orbiter Interface Test | In English | → Human-computer interaction → Astronautics |
| OIVS | Orbiter Interface Verification Set | In English | → Human-computer interaction → Astronautics |
| OKBC | Open Knowledge Base Connectivity | In English | |
| OLAP | On Line Analytical Processing | In English | → Knowledge management → Data |
| OLDB | On-Line Data Bank | In English | → Data |
| OLE | Object Linking and Embedding | In English | → Software |
| OLE | Object Linking and Embedment | In English | → Computer-based techniques |
| OLERD | Orbiter Landing Emergency Rescue Data | In English | → Data → Astronautics |
| OLIMP | Outil Local d'Information pour la Maîtrise des Produits dangereux | In French | → Software |
| OLPC | One Laptop Per Child | In English | → Computer hardware |
| OLTP | On Line Transaction Processing | In English | → Data |
| OMAS | Operations Management Application Software | In English | → Software → Management |
| OMC | Office of Medical Computing | In English | → Medicine |
| OMEGA | Outil pour les Mutuelles des Électriciens et GAziers | In French | → Software → Insurance → Energy economics → Electrical engineering |
| OMG | Object Management Group | In English | → Organizations and associations → Software |
| OML | Open Methodology License | In English | → Artistic property |
| OMNSH | Observatoire des Mondes Numériques en Sciences Humaines (www.omnsh.org) | In French | → Organizations and associations → Social sciences |
| OMR | Optical Mark Recognition | In English | → Writing systems → Computer-based techniques |
| OMT | Object-Modeling Technique | In English | → Software |
| ONT | Optical Network Terminal | In English | → Networks, communication → Telecommunications |
| OntoUCP | Ontology based Unified Communication Protocol | In English | → Software → Networks, communication |
| OntoUCP | Ontology-based Unified Communication Protocol | In English | → Programming languages |
| OPALE | Outil de Pilotage et d'Aide à L'Expertise | In French | → Software |
| OPALE | Outil Probabiliste des ALimentations Électriques | In French | → Software → Electrical engineering |
| OPC | Open Process Control | In English | → Data |
| OPC | OLE for Process Control | In English | → Networks, communication |
| OPC | Organic Photo Conductor | In English | → Peripheral devices |
| OPIDF | Operational Planning Identification File | In English | → Files → Management |
| OPL | Open Proxy List | In English | → Software → Networks, communication |
| OPML | Outline Processor Markup Language | In English | → Programming languages |
| OPPTIC | Organisation de Professionnels pour la Promotion des TIC en région Languedoc-Roussillon | In French | → Networks, communication → Organizations and associations → Telecommunications |
| OPSA | OSSTMM Professional Security Analyst | In English | |
| OPSDB | Operations Data Base | In English | → Data |
| OPSDBA | Operations Data Base Administrator | In English | → Data → Management |
| OPSE | OSSTMM Professional Security Expert | In English | |
| OPSIS | Observation et Prospective sur la Société de l'Information et ses Services | In French | → Telecommunications |
| OPST | OSSTMM Professional Security Tester | In English | |
| OQL | Object Query Language | In English | → Programming languages → Data |
| ORAM | Output Random Access Memory | In English | → Memories |
| ORAP | Organisation Associative du Parallélisme | In French | → Organizations and associations |
| ORB | Object Request Broker | In English | → Networks, communication |
| ORC | Optical Character Recognition = ROC | Reconnaissance Optique de Caractères | In French |
In English | → Writing systems → Computer-based techniques |
| 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 | → Knowledge management |
| ORDBMS | Object-Relational Database Management System | In English | → Data |
| ORDI | Ontology Representation and Data Integration | In English | → Software |
| ORGUE | Outils de Réorganisation de la Gestion Unifiée des Entités | In French | → Software |
| ORIC | ORganisation Informatique Comptable | In French | → Accounting |
| ORRCA | Ontario Research Centre for Computer Algebra (www.orcca.on.ca) | In English | → Research institutes → Algebra → Canada |
| ORSDI | Oak Ridge Selective Dissemination of Information | In English | → Knowledge management |
| OS | Operating Software | In English | → Software |
| OS | Operating System | In English | → Operating systems |
| OS3B | Open Software Blanc Bleu Belge | In French | → Organizations and associations → Software → Belgium |
| OSCAR | Outils de Services, Conseils et Assistance Rapide | In French | |
| OSCF | Operations Support Computing Facility | In English | |
| OSCR | Orbiter Software Change Request | In English | → Software → Astronautics |
| OSDL | Open Source Development Labs | In English | → Software |
| OSDL | Open Source Development Lab | In English | → Software |
| OSE | Open System Environment | In English | |
| OSF | Open Software Foundation | In English | → Foundations → Software |
| OSGi | Open Services Gateway initiative (www.osgi.org) | In English | → Organizations and associations → Software |
| OSI | Open Source Initiative | In English | → Software |
| OSID | Operating System Interface Definition | In English | → Operating systems → Human-computer interaction |
| OSIM | Open Source In Morocco | In English | → Organizations and associations → Software → Morocco |
| OSIRIS | Outil de Synthèse Informatique des Résultats et Indicateurs Standardisés | In French | → Software |
| OSIRIS | Organisation et Système Informatisé de Rangement des Informations Stratégiques | In French | → Software |
| OSIRIS | Observatoire des Systèmes d'Informations, des Réseaux et des Inforoutes au Sénégal (www.osiris.sn) | In French | → Organizations and associations → Software → Networks, communication → Telecommunications |
| OSPF | Open Shortest Path First | In English | → Internet |
| OSRBD | Operational Software Reliability Benchmark Development | In English | → Software |
| OSSIU | Orbiter-Space Station Interface Unit | In English | → Human-computer interaction → Astronautics |
| OSSTMM | Open Source Security Testing Methodology Manual | In English | |
| OSTDS | Office of Space Tracking and Data Systems | In English | → Data → Astronautics |
| OSWA | Organizational Systems Wireless Auditor | In English | |
| OT | Ohjelmistotekniikka = IT | Information Technology | In English = IT | Informationstechnik | In German = IT | Inligtingstegnologie | In Afrikaans = TI | Tecnologia da Informação | In Portuguese = TI | Tecnoloxías da información | In Galician = UT | Upplýsingatækni | In Icelandic = IT | Informationsteknik | In Swedish = IT | Informacijska Tehnologija | In Slovenian = IT | Informačné Technológie | In Slovak = ІТ | Інформаційні технології | In Ukrainian = ИТ | Информационные технологии | In Russian = IT | Informa Teknologio | In Esperanto = TI | Tecnologías de la Información | In Spanish = IT | Informacinės Technologijos | In Lithuanian = IT | Informācijas Tehnoloģijas | In Latvian |
In Finnish | → Telecommunications |
| OTDA | Office of Tracking And Data Acquisition | In English | → Data |
| OTP | One-Time Password | In English | |
| OVAL | Open Vulnerability and Assessment Language | In English | |
| ÖWA | Österreichische Webanalyse (www.oewa.at) | In German | → Organizations and associations → Internet → Austria |
| OWASP | Open Web Application Security Project (www.owasp.org) | In English | → Software |
| OWL | Web Ontology Language | In English | → Programming languages → Data → Internet → Semiotics |
| OWL-D | Ontology Web Language Description Logics | In English | → Programming languages → Data → Internet → Semiotics |
| OWL-S | Web Ontology Language for Web Services | In English | → Programming languages → Data → Internet → Semiotics |
| OWSE | OSSTMM Wireless Security Expert | In English | |
| P&D | Panels and Displays | In English | → Human-computer interaction |
| P&I | Performance and Interface | In English | → Human-computer interaction |
| P2P | Peer-to-Peer | In English | → Networks, communication |
| P3P | Platform for Privacy Preferences | In English | → Software |
| PaaS | Platform as a Service | In English | |
| PACLIDO | Protocoles et Algorithmes Cryptographiques Légers pour l’Internet Des Objets | In French | → Networks, communication → Internet |
| PACS | Picture Archiving and Communication System | In English | → Image processing → Medicine |
| PADSIM | Probabilistic Adaptive Simulation Model | In English | → Computer simulation |
| PAIR | Portal to Asian Internet Resources | In English | → Libraries → Internet |
| PAL | Programmable Array Logic | In English | → Computer hardware → Electronics |
| PALP | Programme d'Armement à Logiciel Prépondérant | In French | → Military engineering → Software |
| PAMI | Pattern Analysis and Machine Intelligence | In English | → Artificial intelligence → Computer-based techniques |
| PAMPAS | Pioneering Advanced Mobile Privacy and Security (www.pampas.eu.org) | In English | → Computer-based techniques → Telecommunications |
| PANS | Personal Area Network System | In English | → Networks, communication |
| PANTER | Poste Auxiliaire de Numérisation, de Tracé et d'Études de Réseaux | In French | → Computer-based techniques → Energy economics → Electrical engineering |
| PAPI | Point d'Accès Public à Internet | In French | → Internet |
| ParC | Parallel Computing | In English | → Serial publications, periodicals |
| PARC | Palo Alto Research Center (www.parc.com) | In English | → Research institutes |
| PaReL | Pattern Recognition Letters | In English | → Serial publications, periodicals → Computer-based techniques |
| PARS | Programmed Airline Reservation System | In English | → Software → Transport by air → Tourism |
| PASCAL | Pattern Analysis, Statistical Modelling and Computational Learning (www.pascal-network.org) | In English | → Artificial intelligence |
| PASO | Pattern-Oriented Software Architecture | In English | → Software |
| PASS | Primary Avionics Software System | In English | → Software → Aeronautics, aircraft |
| PASSaGE | Pattern Analysis, Spatial Statistics and Geographic Exegesis | In English | → Computer-based techniques → Geography |
| PASTISS | Professional Analysis Software Tool for Inflatable Space Structures | In English | → Software → Mechanical engineering |
| PATRIARCHE | Patrimoine Archéologique | In French | → Databases → Archeology |
| PauLLA | Pau Logiciels Libres Association | In French | → Associations → Software → Operating systems |
| PBB | Provider Backbone Bridge | In English | → Networks, communication → Telecommunications |
| PBB-TE | Provider Backbone Bridge - Traffic Engineering | In English | → Networks, communication → Telecommunications |
| PBBN | Provider Backbone Bridge Network | In English | → Networks, communication → Telecommunications |
| PBEB | Provider Backbone Edge Bridge | In English | → Networks, communication → Telecommunications |
| PBIC | Programmable Buffer Interface Card | In English | → Computer hardware → Software |
| PBIM | Programmable Buffer Interface Module | In English | → Software → Human-computer interaction |
| PBL | Policy Block List | In English | → Software → Networks, communication |
| PBS | Portable Batch System | In English | → Software → Networks, communication |
| PBS | Print Batch Services | In English | → Software → Peripheral devices |
| PBT | Provider Backbone Transport | In English | → Networks, communication → Telecommunications |
| PC | Personal Computer = PK | Persoanlike kompjûter | In Frisian |
In English | → Computer hardware |
| PC&PM | Program Control and Performance Management | In English | → Software |
| PC-DOS | Personal Computer Disk Operating System | In English | → Operating systems |
| PCAM | Punched-Card Accounting Machine | In English | → Computer hardware → Accounting |
| PCDATA | Parsed Character Data | In English | → Data |
| PCGI | Perl Common Gateway Interface | In English | → Programming languages → Networks, communication |
| PCI | Peripheral Component Interconnect | In English | → Computer hardware → Telecommunications |
| PCI | Peripheral Controller Interface | In English | → Human-computer interaction |
| PCI-E | Peripheral Component Interconnect Express | In English | → Electronics |
| PCL | Programming Checklist | In English | → Software |
| PCM | Pulse Code Modulation | In English | → Computer-based techniques → Music |
| PCMCIA | Personal Computer Memory Card International Association | In English | → Associations → Memories |
| PCMU | Programmable Control and Monitor Unit | In English | |
| PCRAM | Phase Change Random Acces Memory | In English | → Memories |
| PCRE | Perl-Compatible Regular Expression | In English | → Software |
| PCS | Professional Clinical Software | In English | → Software → Medicine |
| PDA | Personal Digital Assistant | In English | → Telecommunications |
| PDA | Pushdown Automaton | In English | |
| Portable Document Format | In English | → Programming languages → Data → Document processing |
|
| PDH | Plesiochronous Digital Hierarchy | In English | → Telecommunications → Networks, communication |
| PDI | Praktijkdiploma Informatica | In Dutch | → Specialized or polytechnical colleges |
| PDL | Plan de Développement Logiciel | In French | → Software |
| PDM | Processor Data Monitor | In English | → Human-computer interaction → Data |
| PDP-1 | Programmed Data Processor-1 | In English | → Computer hardware |
| PDSDL | Python-based Dynamic System Description Language | In English | → Programming languages |
| PDU | Protocol Data Unit | In English | → Networks, communication |
| PDU | Pilot Display Unit | In English | → Human-computer interaction → Aeronautics, aircraft → Astronautics |
| PE | Parity Error | In English | |
| PEM | Privacy Enhanced Mail | In English | → Software |
| PENELOP | Protocole Étendu et Normalisé d'Échanges en Ligne pour les Opérations Patrimoniales | In French | → Networks, communication → Banks |
| PERL | Practical Extraction and Report Language | In English | → Computer programs |
| PERM | Programmgesteuerte Elektronische Rechenanlage | In German | → Computer hardware |
| PESSL | Parallel Engineering and Scientific Subroutine Library | In English | → Programming languages → Mathematics and natural sciences → Engineering, technology |
| PET | Persona-Enabling Toolkit | In English | → Networks, communication → Telecommunications |
| PET | Personal Electronic Transactor | In English | → Computer hardware |
| PETSCII | PET Standard Code of Information Interchange | In English | |
| PEXI | Pupitre d'EXploitation Informatisé | In French | → Computer hardware |
| PFB | Payload Forward Bus | In English | → Computer architecture → Astronautics |
| PFS | Primary Flight Software | In English | → Software → Aeronautics, aircraft → Astronautics |
| PGC | Progiciel de Gestion du Contenu | In French | → Software → Knowledge management |
| PGI | Progiciel de Gestion Intégrée | In English | → Software |
| PGI | Progiciel de Gestion Intégré | In French | → Software |
| PGML | Precision Graphics Markup Language | In English | → Programming languages → Image processing |
| PGSC | Payload and General-Support Computer | In English | → Computer hardware → Astronautics |
| PHAROS | Platform for searcH of Audiovisual Resources across Online Spaces (www.pharos-audiovisual-search.eu) | In English | → Networks, communication → Computer-based techniques |
| PHB | Per Hop Behavior | In English | → Networks, communication → Telecommunications |
| PHF | Parts History File | In English | → Files |
| PHP | Personal Home Page | In English | → Programming languages → Networks, communication |
| PHP | PHP Hypertext Preprocessor | In English | → Programming languages → Networks, communication |
| PHP/FI | Personal Home Page Tools/Form Interpreter | In English | → Software → Programming languages |
| PI&A | Personnel Identification and Authentication | In English | → 00495 → Labour, labour economics |
| PICC | Payload Interface Control Computer | In English | → Computer hardware → Human-computer interaction → Astronautics |
| PICO | Program In, Chip Out | In English | → Software → Computer hardware |
| PICP | Program Interface Control Plan | In English | → Human-computer interaction |
| PICS | Protocol Implementation Conformance Statement | In English | → Standardization → Networks, communication → Telecommunications |
| PICS | Platform for Internet Content Selection | In English | → Internet |
| PIDS | Portable Image Display System | In English | → Human-computer interaction |
| PIDS | Protocol-based Intrusion Detection System | In English | → Software |
| PIITHIE | Plagiat et Impact de l'Information Textuelle recHerchée dans un contexte InterlinguE (www.piithie.com) | In French | → Computer-based techniques → Linguistics |
| PIM | Portail Intranet Mobile | In French | → Networks, communication → Telecommunications |
| PIN | Persoonlijk Identificatienummer | In Dutch | → Telecommunications |
| PINCH | Payload Integration Nominal Cost Hardware | In English | → Computer hardware → Astronautics |
| PING | Packet Internet Gopher | In English | → Internet |
| PIP | Pew Internet & American Life Project (www.pewinternet.org) | In English | → Internet |
| PIRN | Preliminary Interface Revision Notice | In English | → Human-computer interaction |
| PIRN | Proposed Interface Revision Notice | In English | → Human-computer interaction |
| PK | Persoanlike kompjûter = PC (look above) |
In Frisian | → Computer hardware |
| PK | Persona Komputilo | In Esperanto | → Computer hardware |
| PKD | Programmable Keyboard and Display | In English | → Human-computer interaction |
| PKI | Public Key Infrastructure | In English | |
| PL/1 | Programming Language number 1 | In English | → Programming languages |
| PL/M | Programming Language for Microcomputers | In English | → Software |
| PLA | Programmable Logic Array | In English | → Computer hardware → Electronics |
| PLD | Programmable Logic Device | In English | → Computer hardware → Electronics |
| PLDF | Payload Data File | In English | → Files → Astronautics |
| PLDI | Programming Language Design and Implementation | In English | → Programming languages |
| PLEAC | Programming Language Examples Alike Cookbook | In English | → Programming languages |
| PLEXdb | Plant Expression Database (www.plexdb.org) | In English | → Data → Genetics → Botany → Biotechnology |