| Acronym | Meaning |
| FPEIS | Fine Particulate Emissions Information System |
| UNO-CAS | Unrestricted Natural Orbital-complete Active Space |
| IS | Ionization Spectroscopy |
| CERDA | Coincident Elastic Recoil Detection Analysis |
| NBMO | Nonbonded Molecular Orbital |
| NWWA | Northwest Water Authority (UK) |
| CFSO | Crystal Field Surface Orbital |
| EROS | Earth Resources Observation Satellite |
| IUPHAR | International Union Of Pharmacology |
| IEEM | Ion-electron Emission Microscopy |