| Abbreviation | Definition |
|---|---|
| NVI | No Value Indicator |
| NVL | Null Value Logic |
| NW | New Write |
| NWRA | North West Regional Assembly |
| OA | Object Address |
| OAC | Orbital Assembly Corporation |
| OBCA | On Board Calibration Assembly |
| OBCA | Only Believe Christian Assembly |
| OC | Output Compare |
| OCC | Obscure Canon Character |
| OCL | Operations Control Language |
| OCT | Object Code Technology |
| OD | Octal Dump |
| ODF | Object Definition File |
| OF | Overflow Flag |
| OFS | Object File System |
| OFTA | Onsite First Time Assembly |
| OMC | Obscene Message to Console |
| OOP | Ordinary Object Pointer |
| OPO | Order Pizza for Operator |