| Acronym | Meaning |
| EIS | Emissions Inventory System (US EPA Air Database) |
| NEE | Net Ecosystem Exchange |
| PAUR | Photochemical Activity And Solar Ultraviolet Radiation [project] |
| ONWI | Office Of Nuclear Waste Isolation |
| APSIS | Athenian Photochem. Smog Intercomparison Of Simulations |
| ESIE | Electron Stimulated Ion Emission |
| MCSCF | Multi Configuration Self Consistent Field |
| HPTP | Human Protein Tyrosine Phosphatase |
| POS | Points-on-a-sphere (repulsion Potential Model |
| ORV | Optical Retardation Velocity |