| Acronym | Meaning |
| RMP2 | Restricted Moeller-Plesset Second-order (perturbation Theory) |
| REM | Reservoir Eutrophication Model |
| SAD | Selected Area Diffraction Patterns (crystal Chemistry) |
| IRC | Intrinsic Reaction Coordinate |
| STEAM | Stimulated Echo Acquisition Mode |
| EPC | European Patent Convention |
| E-2PH-TDA | Extended Two-particle-hole Tamm-Dancoff Approxn. (green-function Method For Ionization-energy Calcns.) |
| BPDA | 3,3',4,4'-biphenyltetracarboxylic Dianhydride |
| DAP | Diallyl Phthalate |
| RKI | Rotary Kiln Incinerator |