| Acronym | Meaning |
| HSF | Hiller-Sucher-Feinberg (equation For Calcn. Of Spin Densities And Charge Densities In Mols.) |
| PDF | Probability Density Function |
| NADC | National Animal Disease Center |
| OSF | Odor Safety Factor |
| BDOC | Biodegradable Dissolved Organic Carbon |
| MRV | Mini Rotary Viscometer |
| VMC | Variational Monte Carlo (quantum Calcn. Method) |
| APSIS | Athenian Photochem. Smog Intercomparison Of Simulations |
| COS | Cosmic Origins Spectrograph |
| MICROSS | Micro-computer Based River Oil Spill Simulation |