| Acronym | Meaning |
| LD | Lethal Dose |
| GWPS | Groundwater Protection Standard |
| FHNC | Fermi Hypernetted Chain Method (in Quantum Statistics) |
| NDPD | National Data Processing Division |
| VACSY | Variable-angle Correlation Spectroscopy |
| PT | Perturbation Theory |
| VOFF | Valence Orbital Force Field |
| ABXP | Ab Initio Dv-x.alpha. Point Charge Approxn. (in Solid Surface Electronic Structure Calcn.) |
| PILC | Pillar Interlayered Clays |
| CTBT | Comprehensive Test Ban Treaty |