| Abbreviation | Definition |
|---|---|
| PMI | Phase Measuring Interferometer |
| PMM | Permanent Magnet Motor |
| PMMA | PolyMethyl MethAcrylate |
| PMOS | Positive channel Metal-Oxide Semiconductor |
| PMPO | Peak Music Power Output |
| PMS | Parking Management System |
| PMS | Particle Measuring System |
| PMT | Photo-Multiplier Tube |
| PMTF | Product Management Task Force |
| PN | PAL to NTSC conversion |
| PN | Pseudo Noise |
| PNEL | Printed Nano Electronics Laboratory |
| PNG | Portable Network Graphics image format |
| PNP | Positive-Negative-Positive |
| PNPN | Positive-Negative-Positive-Negative (transistor) |
| PNVS | Pilot Night Vision System |
| PO | Partial Open |
| PO | Power Outage |
| PO | Power Output |
| POEM | Plumbing Operational Electrical And Mechanical |