| Acronym | Meaning |
| USGS | United States Geological Survey |
| OC | Office Of The Comptroller |
| GIT | Gastrointestinal Tract |
| EKF | Extended Kalman Filter |
| ECF | Elemental Chlorine Free [as In Nonchlorine Bleaching] |
| BCR | Bureau Communitaire De Reference (of The CEE = Commission Of European Communities |
| MM | Misch Metal |
| UCP | Uncoupling Protein |
| WSOC | Water-soluble Organic Carbon |
| NMJ | Neuromuscular Junction |