| Acronym | Meaning |
| DSS | Deep Seismic Sounding |
| FCSA | Frequency-corrected Sudden Approxn. (in Mol. Collision Calcns.) |
| RIA | Regulatory Impact Analysis |
| FPC | Fractional Parentage Coeff. (in Group-theor. Calcns.) |
| RASS | Ratio Acoustic Sounding System |
| LOGMO | Lowest Occupied Gaussian Molecular Orbital |
| TEV | Tobacco Etch Virus |
| GDWB | Generalized Distorted-wave Born (approxn. Or Theory) |
| EGM | Electron Gas Model |
| IGWMC | International Ground Water Modeling Center |