| Acronym | Meaning |
| CI | Chemical Ionization |
| ARM | Advanced Reservoir Management (petroleum) |
| EBSM | Extended Breathing Shell Model |
| GRVB | Generalized Resonating Valence Bond |
| BSC | Bundle Sheath Cellpar |
| MP2-R12 | MP2 Theory With Terms Linear In Interelectronic Distance (r12) |
| MEMPT | Many-electron Many-photon Theory (in Dynamic-polarizability Calcns. For Atoms And Ions) |
| SWICH | Solid Waste Information Clearinghouse And Hotline |
| BGC | Biogeochemical Cycling |
| PRESS | Prediction Error Sum Of Squares |