| Abbreviation | Definition |
|---|---|
| OTA | Operational Transconductance Amplifier |
| OTE | Outside Thermal Exhaust |
| OTP | Open Technology Platform |
| OTP | Open Telecommunications Platform |
| OTP | Over-Temperature Protection |
| OTPH | Operational Test Program Hardware |
| OTS | Overload Test Set |
| OUM | Ovonic Unified Memory |
| OVA | Open Virtual Appliance |
| OVLO | Overvoltage-Lockout |
| OVS | Outdoor Viewing System |
| P | Processor |
| P2 | Pentium II |
| P4 | Pentium IV |
| P4-M | Pentium IV (laptop version) |
| P5 | Pentium '586 CPU |
| PA | Power Adapter |
| PA | Power Amplifier |
| PA | Public Address |
| PAA | Personal Audio Amplifier |