| Acronym | Meaning |
| RIS | Rotational Isomeric State |
| CCST | Complex Coordinate Scattering Theory |
| CUSMAP | Conterminous United States Mineral Assessment Program |
| RODS | Records Of Decision System |
| ABG | Arterial Blood Gas |
| DRES | Dietary Risk Evaluation System |
| AIST | Agency Of Industrial Science And Technology (Japan) |
| MECI | Monoexcited Configuration Interaction |
| RET | Resonance Energy Transfer |
| ROBK2 | Relativistic Second-order Oppenheimer-Brinkman-Kramers (in Ion-scattering Calcns.) |