| Acronym | Meaning |
| EESOP | Electronegativity Equalization With S-orbital Participation |
| PUCHF | Perturbed Uncoupled Hartree-Fock |
| ABBOT | Atomic Billiard Ball Orbital Theory |
| CSA | Chemical-shift Anisotropy |
| CWA | Chemical Warfare Agent |
| SPIRIT | Spatial IR Imaging Telescope |
| ETS | Environmental Tobacco Smoke |
| LMC | Large Magellanic Cloud |
| NAPAP | National Acid Precipitation Assessment Program |
| ITRC | Interstate Technology And Regulatory Cooperation Working Group |