| Full Form | Category | Term |
|---|---|---|
| Open Sound System | Information Technology | OSS |
| Open-Source Software | Information Technology | OSS |
| Operations Support System | Information Technology | OSS |
| Operations Support Systems | Computer and Networking | OSS |
| Omnitrax Switching Services | Telecommunication | OSS |
| Operation Support System | Telecommunication | OSS |
| Operator Services System | Telecommunication | OSS |
| Operation Support Systems | Telecommunication | OSS |
| Microsoft Office Search Result | File Type | OSS |
| Openly Stealable Source | Softwares | OSS |
| Opera Schedule Server | Softwares | OSS |
| Open Source Software | Softwares | OSS |
| Operating Systems Software | Softwares | OSS |
| Operating System Switch | Softwares | OSS |
| Object Services Standard | Electronics | OSS |
| Oh So Social | Messaging | OSS |
| Operational Support System | Space Science | OSS |
| Oex (orbiter Experiments) Support System | Space Science | OSS |
| Office of Space Science | Space Science | OSS |
| Optics Sub-system | Space Science | OSS |
| Orbiting Space Station | Space Science | OSS |
| Osh | Airport Code | OSS |
| Open Source Systems | Computer Hardware | OSS |
| Other Stable Shareholders | Stock Exchange | OSS |
| Ontario Sire Stakes | Sports | OSS |
| Office of Strategic Services | Military and Defence | OSS |
| Optical Surveillance System | Military and Defence | OSS |
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