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Abkürzung-Kategorie: o
| Abkürzung | Langform |
| OPA | Old Programmers Association |
| OPA | Open Protocol Architecture |
| OPA | Overview Pac Attribute |
| OPAC | Online Public Access Catalogue |
| OPAL | Optische Anschlussleitung |
| OPB | On-Chip Peripheral Bus |
| OPC | Output Control |
| OPC | Optical Photo Conductor |
| OPC | Optical Proximity Correction |
| OPC | OLE for Process Control |
| OPCAT | Object Process CASE Tool |
| OPD | Output Driver |
| OPD | Original Point of Distribution |
| OPD | Oberpostdirektion |
| OPEC | Organisation of Pertol Exporting Countries |
| OPEN | Optical Pan-European Network |
| OPI | Operator Interface |
| OPI | Open Prepress Interface |
| OPIC | Open Programmable Interrupt Controller |
| OPIE | Open Palmtop Integrated Environment |
| OPL | Open Publication License |
| OPM | Object Process Methodology |
| OPM | Operations Per Minute |
| OPM | Output Protection Management |
| OPML | Outline Processor Markup Language |
| OPN | Open Projects Network |
| OPOCE | Amt für Veröffentlichungen der EU |
| OPP | Open Publication Policy |
| OPS | Online Programming and Simulation |
| OPS | Open Profiling Standard |
| OPSEC | Open Platform for Security |
| OPT | Open Protocol Technology |
| opt | Optionen für Delphi |
| OPTA | Onafhankelijke Post en Telecommunicatie Autoriteit (NL) |
| OPUS | Overlay Peer Utility Service |
| OPUS | Octal Program Updating System |
| OPUS | Online Publikationsverbund der Universität Stuttgart |
| OPX | Off Premises Extension |
| OQL | Object Query Language |
| OQPSK | Offset Quadrature Phase Shift Keying |
| OR | Operations Research |
| or2 | Lotus Organizer 2.x Datei |
| or3 | Lotus Organizer File |
| ORACLE | Optional Reception of Announcement by Coded Line Electronics |
| ORB | Object Request Broker |
| ORBL | Open Relay Black List |
| ORC | Oxidation Reduction Catalyst |
| ORDB | Open Relay Data Base |
| org | Terminplanerdatei (Lotus Organizer) |
| ORG | organizational; Internet-Domain: Organisationen in den USA |