| Acronym | Meaning |
| PIO | Paired Interaction Orbital |
| SEU | Selective Excitation Unit |
| NOHS | National Occupational Hazard Survey |
| MIMS | Membrane Introduction Mass Spectrometry |
| NCLAP | National Crop Loss Assessment Program |
| LEEIXS | Low Energy Electron Induced X-ray Spectrometry |
| LDF | Local Density Functional |
| MP2(FC) | MP2(frozen Core) Only (outer) Valence Electrons Included In The Approximation |
| MARIA | Methods For Assessing The Radiological Impact Of Accidents |
| ISM | Interaction Site Model (in Statistical Mechanics Of Fluids) |