| Acronym | Meaning |
| MCH | Melanin Concentrating Hormone |
| PPP | Positron Polarization Potential |
| CAS-CI | Complete Active Space-configuration Interaction |
| BSA | Breathing-sphere Approxn. (for Inelastic Mol. Collisions) |
| TDPAC | Time Differential Perturbed Angular Correlation |
| SCE | Sister Chromatid Exchange |
| IMEP | International Measurement Evaluation Program |
| PSMO | Pseudo MO |
| EIGA | European Industrial Gases Association |
| POA | Preoptic Area |