| Abbreviation | Definition |
|---|---|
| OTTIMO | Over The Top In My Opinion |
| OTU | One Time Use |
| OTU | Oven Timer Unit |
| OVC | Output Video CODEC |
| OVHL | OVerHauL |
| OVI | Optically Variable Ink |
| OVO | HP OpenView Operation |
| OWG | Online World Guide |
| OWLE | Optical Widgets for Life Enhancement |
| OXAIR | Oxygen Air enrichment system |
| OXB | Office Xerolith Bond paper |
| OYF | Off Your Face |
| P | Parfum |
| P | Part |
| P | Plug |
| P | Portable |
| P | Powertip |
| P | Push |
| PA | Partially Assembled |
| PA | Pulse Arc welder |