 Permissive Action Link | Military |
| Programmable Array Logic | Technology |
| Pall | Organizations |
| Phase Alternation Line | Technology |
| Process Assembly Language | Technology |
| Prototype Application Loop | Technology |
| Paducah and Louisville Railroad | Organizations |
| Pallet | Science |
| Paradox Application Language | Technology |
| Paradox Applications Language | Technology |
| Passenger Acceleration Lane | Government |
| Personnel Allowance List | Military |
| Phase Alteration Line | Technology |
| Positron Annihilation Lifetime | Science |
| Production and Application of Light | Technology |
| Programmer Assistance and Liaison | Technology |
| Programming Assembly Language | Technology |
| Parts Accumulation List | Science |
| Phase Alternating Line | Technology |
| Preventative Action Limits | Science |