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Abkürzung-Kategorie: o
| Abkürzung | Langform |
| org | Organization (Nichtkommerzielle Organisation) |
| ORNL | Oak Ridge National Laboratory |
| OROM | Optical Read Only Memory |
| ORP | Open Router Project |
| ORS | Output Record Separator |
| ORVR | Onboard Refueling Vapour Recovery System |
| OS | Operating System |
| OS | Oxygen Sensor |
| OS | Output Specification |
| os2 | NDIS-Treiber für OS2. |
| OSA | Optical Society of America |
| OSA | Open Scripting/Services/Solutions/Storage/Systems Architecture |
| OSAC | Orifice Spark Advance Control |
| OSACA | Open System Architecture for Controls within Automation Systems |
| OSAF | Origin Subarea Address Field |
| OSC | Operating System Command |
| OSC | Open System Center (IBM) |
| OSC | On Scene Commander |
| OSCAR | Orbiting Satellite Carrying Amateur Radio |
| OSCI | Online Services Computer Interface |
| OSD | On Screen Display |
| OSD | Open Software Description (Format) |
| OSD | Open Source Definition |
| OSDL | Open Source Development Lab, Oregon |
| OSE | Open Systems/Software Environment |
| OSEK | Offene Systeme und deren Schittstellen im Kfz |
| OSF | Open Software Foundation |
| OSHA | Occupational Safety and Health Administration |
| OSI | Open Systems Interconnect/Interconnection (ISO) |
| OSIE | Open Systems Interconnection Environment |
| OSINLCP | OSI Network Layer Control Protocol |
| OSITOP | Open Systems Interconnection Technical and Office Protocols |
| OSL | Object Script Language |
| OSL | Open Subscription License |
| OSM | Operating System Specific/Service Module |
| OSM | On Screen Menue |
| OSNR | Optical Signal to Noise Ratio |
| OSO | Overscan Operation |
| OsParCom | Oslo-Paris Commission (Schutz der Nordsee) |
| OSPF | Open Shortest Path First (Internet) |
| OSPI | Operating System Programming Interface |
| OSPM | Operating System direct Power Management |
| OSQL | Object Structured Query Language |
| OSS | Object Storage Server |
| OSS | Online Service System |
| OSS | Open Sound System |
| OSS | Operational/Operator Support System |
| OSS | Open Source Software/Solution |
| OSSO | Open Source Solutions Operation (HP) |
| OSTA | Optical Storage Technology Association |