| Acronym | Meaning |
| BRI | Building-related Illness |
| ELF | Electron Localization Function |
| ETP | Environmental Tracking Procedure |
| AWRA | American Water Resources Association |
| PIAS | Photon-counting Image Acquisition System |
| CAI | Carcinogenic Activity Indicator |
| QDA | Quadratic Discriminant Analysis |
| TBBA | Tightly-bound-on-the-bond Approxn. (band Structure Crystal) |
| TCC | Thermal Contact Cracking |
| AVCC | Average Carbonaceous Chondrites |