| Acronym | Meaning |
| HID | Helium Ionization Detector |
| NTTAA | National Technology Transfer And Advancement Act |
| ECOP | Electron Correlation Polarization (potential) |
| MOX | Mixed Oxide |
| PAC | Polyaluminum Chloride |
| LTU | Land Treatment Unit |
| RASA | Regional Aquifer Systems Analysis (program Of USGS) |
| CAK | Cdk-activating Kinase |
| SCTDA | Separated Channel Tamm-Dancoff Approxn. |
| DSW | Dirac Scattered-wave (often As SCF-X(alpha)-DSW Method) |