| Acronym | Meaning |
| ETEX | European Tracer Experiment |
| BRET | Bioluminescence Resonance Energy Transfer |
| PWG SCF | Plane-wave Gaussian Self-consistent Field Method |
| XRFA | X-ray Fluorescence Analysis |
| ECAMSI | Electron Configuration Analysis For Many-system Interactions |
| MHC | Major Histocompatibility Complex |
| SA-MCSCF | State Averaged Multiconfiguration Self-consistent Field (wave Function) (see Also ICF-CI) |
| HDR | Hot Dry Rock (geothermal Reservoir) |
| NPA | Natural Population Analysis |
| AL:PE | Acidification Of Mountain Lakes: Paleolimnol. And Ecol. |