| Acronym | Meaning |
| NPP | Nuclear Power Plant |
| VB | Valence Bond |
| TFRS | Transition Flow Reaction System |
| GRASS | Gradient Recalled Acquisition In The Steady State |
| AGB | Asymptotic Giant Branch (stars) |
| NASN | National Air Sampling Network |
| THM | Traveling Heater Method |
| CAIBE | Chemically Assisted Ion Beam Etching |
| SARM | Synthetic Analytical Reference Matrix (US EPA) |
| MEPSAG | Minimum Energy Path Semiclassical Adiabatic Ground-state (tunneling Approxn.) |