| Acronym | Meaning |
| REO | Rare Earth Oxide |
| CMC | Coupled Multiconfiguration |
| ESS | European Spallation Source |
| INR | International Normalized Ratio |
| ARSCF | Approximate Relativistic SCF |
| PIGS | Pesticides In Groundwater Strategy |
| PCS | Permit Compliance System |
| POSAP | Position-sensitive Atom Probe |
| PDK | Pyruvate Dehydrogenase Kinase |
| APS | Autocorrelation Photon Spectroscopy |