| Acronym | Meaning |
| SPP | Suspended Particulate Phase |
| AF | Audio Frequency |
| REA | Reactive Arthritis |
| EFOIA | Electronic Freedom Of Information Act |
| SSNTD | Solid-state Nuclear Track Detector |
| LFL | Lower Flammable Limit |
| IRM | Information Resources Management |
| ESD | Environmental Services Division (US EPA) |
| ATCC | American Type Culture Collection |
| HLW | High-Level Waste |