| Acronym | Meaning |
| ACAR | Angular Correlation Of Annihilation Radiation |
| PPHM | Parts Per Hundred Million |
| WSD | Wear Scar Diameter |
| FEL | Free Electron Laser |
| IUAM | Independent United Atom Model (in Positron Scattering By Mols.) |
| TDO | Truncated Diatomic Orbital (a MO) |
| HERG | Human Ether-a-go-go-related Gene |
| DIANA | Detection Of Immobilized Amplified Nucleic Acids |
| NETAC | National Effluent Toxicity Assessment Center |
| R-GVB | Resonating-generalized Valence Bond (wave Function) |