P1
| Acronym | Definition |
|---|---|
| P1 | Primary 1 (various locations) |
| P1 | Phase One (superbike team) |
| P1 | Player 1 (video games) |
| P1 | PalmOne |
| P1 | Priority One |
| P1 | Politics1 (website) |
| P1 | Proposition One (grassroots nuclear disarmament organization) |
| P1 | Pentium One (Intel CPU) |
| P1 | Pokémon #1 |
| P1 | MHS X.419 Message Transfer Protocol |