| Full Form | Category | Term |
|---|---|---|
| Operator | Telecommunication | O |
| Online | Networking | O |
| Output | Networking | O |
| Object File ( Unix - Atari - Gcc) | File Type | O |
| Outfile (sprint) | File Type | O$$ |
| Oxygen | Chemistry | O |
| Odor | Chemistry | O |
| Operating | Electronics | O |
| Off | Electronics | O |
| Form O Solenoid (actuator Only, No Contacts) | Electronics | O |
| Oh | Messaging | O |
| Over | Accounts and Finance | O |
| Out | Space Science | O |
| Oort | Space Science | O |
| Omicron | Space Science | O |
| Pint | Measurement Unit | O |
| Overlay | Job Title | O |
| Opportunities | Job Title | O |
| Ohio | Country Specific | O |
| Outdoors | Country Specific | O |
| Oasis | Country Specific | O |
| Ottawa | Country Specific | O |
| Open | Computer Hardware | O |
| Odd | Maths | O |
| Octant | Maths | O |
| Obliqueness | Maths | O |
| Ohm | Physics Related | O |
| Ownership | Stock Exchange | O |
| Outdoor | Sports | O |
| Olympics | Sports | O |
| Outstanding | Military and Defence | O |
| Optional | Military and Defence | O |
| Contour Pattern | Military and Defence | O |
| Objectives | Military and Defence | O |
| Officer | Military and Defence | O |
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