| Abbreviation | Definition |
|---|---|
| PEM | Proton Exchange Membrane |
| PEMF | Pulsed Electro-Magnetic Field |
| PEMFD | Pulsed Electro-Magnetic Field Device |
| PEMI | Portable Engineering Moire Interferometer |
| PEMIII | Portable Engineering Moire Interferometer, Second generation |
| PEMR | Pulsed Electro-Magnetic Radiation |
| PEO | Project Evaluation Objectives |
| PEP | Pauli Exclusion Principle |
| PEPI | Physics of the Earth and Planetary Interiors |
| PEPICO | Photo Electron Photo Ion Coincidence spectOscopy |
| PEPSI | Proton Echo Planar Spectroscopic Imaging |
| PER | Physics Education Research |
| PERTRAN | Perturbation Transport |
| PET | Photosynthetic Electron Transport |
| PETT | Positron Emission Transverse of Transaxial |
| PEV | Peta-ElectronVolt |
| PEWD | Potential Energy Well Depth |
| PF | Particle Flow |
| PF | Photon Flux |
| PFC | Parallel Flange Channel |