| Acronym | Meaning |
| RAA | Rigid-atom Approxn. (in Electronic Structure Calcns.) |
| FFS | Flame Fluorescence Spectroscopy |
| PAC | P1-derived Artificial Chromosome |
| RCP | Reciprocal Calcn. Procedure [of ACGIH] |
| MCH | Melanin Concentrating Hormone |
| CCSD | Coupled Cluster With Single And Double Excitation |
| SWSV | Square-wave Stripping Voltammetry |
| CEEES | Committee Of European Environmental Engineering Societies |
| PBM | Proton Beam Micromachining |
| PCE | Polychromatic Erythrocytes |