| Abbreviation | Definition |
|---|---|
| PMC | PubMed Central |
| PMC | PubMedCentral |
| PMDL | Pere Marquette District Library |
| PML | Phillips Memorial Library |
| PML | Photosynthetic Mutant Library |
| PML | Portable Math Library |
| PMM | Printing and the Mind of Man |
| PMPL | Parallel Motion Planning Library |
| PMPL | Performance Metric Predicate Library |
| PMPL | Pleasant Mount Public Library |
| PMPL | Pocono Mountain Public Library |
| PMPL | Port Moody Public Library |
| PNACL | Pacific Northwest Association of Church Libraries |
| PNCL | Palmerston North City Library |
| PNCL | Philadelphia Neshoba County Library |
| PNL | Probabistic Networks Library |
| pop | population |
| port. | portrait |
| PP | Publishers |
| PPAL | Project Process Asset Library |