| Abbreviation | Definition |
|---|---|
| ON | The Operators For Not |
| ONI | Operational Neural Interface |
| ONP | Open Next Program |
| ONX | Open Node Syntax |
| OO | Object Oriented |
| OO | Objektorientierung |
| OO | Ochrana Ovzdusi |
| OOA | Object Oriented Analysis |
| OOA | Objektorientierte Analyse |
| OOC | Object Oriented Concept |
| OODB | Object-Oriented Data Base |
| OODBMS | Object-Oriented DataBase Management System |
| OODPM | Object Oriented Design by Prototype Methodology |
| OOE | Object-Oriented Engineering |
| OOF | Object Oriented Finite |
| OOG | Object-Oriented Graphics |
| OOM | Out Of Memory |
| OON | Object Oriented Notation |
| OOO | Outside Of the Object |
| OOP | Object Operations Procedure |