| Acronym | Meaning |
| ECCLS | European Committee For Clinical Laboratory Standards |
| BSF | Below Sea Floor |
| KKR | Korringa-Kohn-Rostoker (in Band Structure Calcn.) |
| MBTH | 3-methyl-2-benzothiazolinone Hydrazone |
| MRL | Minimal Risk Levels |
| ECF | Electric Crystal Field |
| PIS | Penning Ionization Spectroscopy |
| ABR | Advanced Breeder Reactor |
| AAAI | American Association For Artificial Intelligence |
| XIS | X-ray Isochromat Spectroscopy |