| Acronym | Meaning |
| PCS | Permit Compliance System |
| RAA | Rigid-atom Approxn. (in Electronic Structure Calcns.) |
| BCV | Bovine Coronavirus |
| ASB | Ambient Stds. Branch [of The US EPA] |
| CID | Charge Injection Device |
| DMR | Discharge Monitoring Report |
| ESR | Electron Spin Resonance |
| LUC | Large Unit Cell Semiempirical Approxn. (for Band Structure) |
| MUFA | Monounsaturated Fatty Acids |
| MC | Metal Carbide |