| Abbreviation | Definition |
|---|---|
| PAPI | Public And Private Information |
| PAR | Privacy Act Release |
| PARI | Primary Access Rights Identifier |
| PARS | Privacy Act Release Statement |
| PAS | Personal Access System |
| PAS | Privacy Act Statement |
| PAS | Protected Area System |
| PASR | Preparatory Action and Security Research |
| PASS | Predicate Alteration Security System |
| PAVA | Public Address and Voice Alarm |
| PAWS | Protection Against Wrapping Sequence |
| PBA | Pre-Boot Authentication |
| PBC | Potential Backup Cost |
| PBC | Push Button Configuration |
| PBE | Password Based Encryption |
| PBM | Partition Boot Manager |
| PCEF | Policy and Charging Enforcement Function |
| PCRF | Policy and Changing Rules Function |
| PCRF | Policy and Charging Rules Function |
| PCS | Permanent Control Security |