| Abbreviation | Definition |
|---|---|
| PBR | Pinned Beam Roll |
| PBS | Polarizing Beam Splitter |
| Pc2 | Continuous Pulsations type 2 |
| PCAP | Physics and Computing Advisory Panel |
| PCCP | Paris Centre for Cosmological Physics |
| PCE | Plasma Crystal Experiment |
| PCF | photonic crystal fiber |
| PCLS | Postulate of Constant Light Speed |
| PCM | Phase Change Material |
| PCN | Physics Computer Network |
| PCR | Preliminary Chain Reaction |
| PCS | Passive Cross Section |
| PCS | Photon Correlation Spectroscopy |
| PCS | Pion Cloud System |
| PCSL | Physics of Complex Systems Laboratory |
| PD | Poincare Duality |
| PD | Polarization Difference |
| PD | Potential Difference |
| PD | Prismatic Diffuser |
| PD | Propagation Delay |