| Acronym | Meaning |
| ESE MO | Essential-structure-elements Molecular Orbital |
| EPACSAR | EPA Chemical Activities Status Report |
| ARGOS | Advanced Research And Global Observation Satellite |
| CRT | Continuously Regeneration Trap |
| RAS | Restricted Active Space (wave Function) |
| EFISH | Elec. Field-induced 2nd-harmonic Generation |
| VGP | Virtual Geomagnetic Pole |
| VNS | Vicarious Nucleophilic Substitution |
| PESOS | Perkin-Elmer Solvent Optimization System |
| INDO/SP | Intermediate Neglect Of Differential Overlap/spin Polarization |