| Acronym | Meaning |
| N-BOD | Nitrogenous Biochemical Oxygen Demand |
| BCT | Best Control Technology |
| F4 | Fourth-order Feenberg (quantum Theory) |
| CMR | Colossal Magnetoresistance |
| MESIMS | Matrix-enhanced Secondary Ion Mass Spectrometry |
| DBTT | Ductile-to-brittle Transition Temperature |
| PRDA | Program Research And Development Announcement |
| APR | Air-Purifying Respirator |
| SPF | Sun Protection Factor |
| TBM | Tight Binding Model |