| Acronym | Meaning |
| EGSB | Expanded Granular Sludge Bed |
| JISC | Japanese Industrial Standards Committee |
| SMO | Statistical Model Of Overlap |
| DOD | Dissolved Oxygen Deficit |
| CASAC | Clean Air Scientific Advisory Committee (US EPA) |
| ZCC | Zero Core Contribution (model For Photodetachment Calcns.) |
| NRA | Neutron Reaction Analysis |
| STAS | Scientific And Technical Attribute And Element Set |
| FIAS | Flow Injection Atomic Spectrometry |
| HDI | High-density Inclusion |