| Acronym | Meaning |
| CHERS | Charge Exchange Recombination Spectroscopy |
| BCR | Bureau Communitaire De Reference (of The CEE = Commission Of European Communities |
| ASFF | Aerated Stationary Or Submerged Fixed-film (wastewater Treatment) |
| PARS | Photoacoustic Raman Spectroscopy |
| AF | Anaerobic Filter |
| DIN | Dissolved Inorganic Nitrogen |
| CGCT | Constrained Geometry Catalyst Technology [polymerization] |
| RHFR | Restricted Hartree-Fock-Roothaan |
| NADC | National Animal Disease Center |
| EEF GTO | Electric Field Gradient Gaussian-type Orbital |