| Acronym | Meaning |
| IUVSTA | International Union Of Vacuum Science |
| ECD | Electron Capture Detector (gas Chromatography) |
| RCI | Relativistic Configuration Interaction |
| OGWDW | Office Of Ground Water And Drinking Water |
| HFIR | High Flux Isotope Reactor |
| CITAC | Cooperation On International Traceability And Analytical Chemistry |
| BCR | B Cell Receptors |
| AQS | Air Quality Standard |
| OCCSD | Open-shell Coupled-cluster (with) Single (and) Double (excitations) |
| CECE | Combined Electrolysis And Chemical Exchange |