| Acronym | Meaning |
| FEMO | Free-electron Molecular Orbital |
| MOR | Modulus Of Resilience |
| DSCCR | Diffractive Sudden-closed Coupled Rotation (for Mol.-surface Scattering Calcns.) |
| RISM | Reference Interaction Site Model |
| ISCA | Ionization Spectroscopy For Chemical Analysis |
| PRZM | Pesticide Root Zone Model |
| PACS | Physics And Astronomy Classification Scheme |
| EIE | Easily Ionized Element |
| PSCI | Pseudo Configuration Interaction |
| BIIR | Brominated Isobutene-isoprene Rubber |