| Acronym | Meaning |
| ETBM | Empirical Tight-binding Method (in Electronic Structure Calcn.) |
| GEK | Geomagnetic Electrokinetograph |
| NEBOSH | National Examination Board In Occupational Safety And Health |
| LASER | Light Amplification By Stimulated Emission Of Radiation |
| CNDO SP | Complete Neglect Of Differential Overlap Spin Polarization |
| MIRACL | Mid Infrared Advanced Chemical Laser |
| ISC | Intersystem Crossing |
| LAMMS | Laser Micro Mass Spectrometry |
| MCPF | Modified Coupled-pair Functional (method In CI Calcns.) |
| OD | Order-Disorder (in Mineral Structure) |