| Acronym | Meaning |
| L2 | Square Integrable (wave Function) (in Electron-atom Or -mol. Collisions) |
| SPEMC-SCF | Selected Paired Excitational Expansion Multiconfiguration-SCF |
| ECSC | European Coal And Steel Community |
| SC-MEH-MO | Self-consistent-modified Extended Hueckel-MO |
| ABSORB | Arctic Beaufort Sea Oilspill Research Body |
| HALOE | Halogen Occultation Experiment |
| SID | Selected Ion Detection |
| NAI | Neutral Atom Imaging (astronomical Plasmas) |
| CWS | Community Water System |
| KKRASA | Korringa-Kohn-Rostoker Atomic-sphere Approxn. (in Band Structure) |