| Acronym | Meaning |
| FIM | Forced Impulse Method (in Atom Ion-impact Ionization) |
| DAXRT | Double-axis Reflection X-ray Topography |
| SNUR | Significant New Use Rule |
| QCA | Quasichemical Approxn. (in Calcns. On Semiconductors) |
| ARIP | Accidental Release Information Program |
| APDB | Antiphase Domain Boundary |
| CDOC | Colored Dissolved Organic Carbon |
| RCIS | Resource Center Information System |
| ACH | Air Changes Per Hour |
| TRIR | Time-resolved IR |