| Abbreviation | Definition |
|---|---|
| PIRS | Pollution Incident Reporting System |
| PIS | Passenger Information System |
| PISA | Phoenix International Sport Automobiles |
| PIST | Parents to Improve School Transportation |
| PIT | Passive Integrated Transponder |
| PIT | Pittsburgh International Airport |
| PIV | Powered Industrial Vehicle |
| PJ | Piece Of Junk |
| PJ | Puddle Jumper |
| PJT | Port Jersey Terminal |
| PKUP | Pickup |
| PKY | Parkway |
| PL | Packing List |
| PL | Parking Lot |
| PL8-QIZ | Plate Quiz |
| PLB | Passenger Loading Bridge |
| PLEV | Personal Light Electric Vehicles |
| PLIPDECO | Point Lisas Industrial Port Development Corporation |
| PLK | Putera Lintas Kemas, Freight Forwarders |
| PLM | Private Label Merchandiser |