| Acronym | Meaning |
| APXPS | Appearance Potential X-ray Photoemission Spectroscopy |
| PBDE | Polybrominated Diphenyl Ether |
| CAI | Computer Aided Instruction |
| PCI-80 | Parametrized Configuration Interaction (with Parameter) 80 |
| LPED | Low-pressure Electric Discharge |
| IAP | Imaging Atom Probe |
| LET | Linear Energy Transfer (in Spacecraft Power Systems) |
| GTG | Gaussian-type Geminal |
| PESC | Passivated Emitter Silicon Solar Cell |
| PMC | Percent Modern Carbon |