| Abbreviation | Definition |
|---|---|
| PIR | Phoenix International Raceway |
| PIR | Portland International Raceway |
| PITA | Portable Instrument for Trace Acquisition |
| PKTR | Public key trace and revoke |
| PLRC | Port Lincoln Racing Club |
| PMRA | Pro Modified Racing Association (Clarence, New York) |
| PMRA | Professional Motorcycle Racing Association |
| PNRC | Penn National Race Course |
| POCP | Progestogen only Contraceptive Pill |
| POIC | progestogen only injectable contraception |
| POIC | progestogen only injectable contraceptive |
| POIC | Progestogen only Injectable Contraceptives |
| PORN | Popular Oppressive Race Names |
| PPIR | Pikes Peak International Raceway |
| PRAC | PRACE |
| PRACA | prac |
| PRACA | prace |
| PRACEX | práce ' x |
| PRACEX | práce X |
| PRAT | Postion Race And Threats |