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Abkürzung-Kategorie: o
| Abkürzung | Langform |
| OSTM | Open System Transaction Management |
| OSTP | Office of Science and Technology Policy |
| OSVS | Operating System Virtual Storage |
| OSZE | Organisation für Sicherheit und Zusammenarbeit in Europa |
| OT | Ordering Table |
| OT | Oberer Totpunkt |
| OT | Object Technology |
| OT | Open Transport |
| OTA | Ochratoxin A |
| OTA | US Congress Office of Technology Assessment |
| OTD | Optical Time Division |
| OTDM | Optical Time Division Multiplexer/Multiplexing |
| OTDR | Optical Time Domain Reflectometer |
| OTF | Open Token Foundation |
| OTF | Open Type Font |
| OTI | Original Transmitter Identification |
| OTP | Open Trading Protocol |
| OTP | One-Time Pad/Password/Programmable |
| OTR | One Touch Record/Recording |
| OTRS | Open Ticket Request System |
| OUI | Organizationally Unique Identifier |
| OUM | Ovonic Unified Memory |
| OURS | Open Users Recommended Solutions |
| out | Outfile von OzWin Ii |
| OV | Overflow |
| ov# | Overlay-Dateien (PC-Tools) |
| OVG | Oberverwaltungsgericht |
| ovl | Overlay Tastatur u. Farbtreiber unter DOs |
| OVL | Overlay |
| ovr | Programmcode Overlay |
| OVST | Ortsvermittlungsstelle |
| OWA | Outlook Web Access |
| OWFS | Optical WORM File System |
| OWG | Optical Waveguide |
| OWiG | Gesetz über Ordnungswidrigkeiten |
| OWL | Object Windows Library |
| OZ | OktanZahl |
| oä | oder ähnlich |