| Acronym | Meaning |
| IHC | Intrinsic Coercivity |
| NEIS | National Environmental Information Service |
| PNRA | Photon-tagged Nuclear Reaction Analysis |
| PSEP | Polyhedral Skeletal Electron Pair (for Metal Clusters) |
| NDT | Nil Ductility Temperature |
| VIMS | Visible And IR Mapping Spectrometer |
| SCS | Soil Conservation Service |
| SIC | Self-interaction Correction (in Exchange-energy Calcns.) |
| MP2(FU) | MP2(full) Inner-core Electrons Are Included In The Approxn. |
| ULTRA | Underground Leak Transport Assessment Model |