| Acronym | Meaning |
| LACO | Linearized Atomic Cell Orbital (in Energy-band Calcn.) |
| GWTR | Ground Water Treatment Rule |
| NPO | National Program Office |
| WAO | Wet Air Oxidation |
| WASP | Workplace Analysis Scheme For Proficiency |
| MITE | Miniature Inverted-repeat Transposable Element |
| HFB | Hybrid Fluidized Bed |
| UNIFAC | Universal Quasichem. Functional Group Activity Coeffs. |
| PBM | Probability-based Matching |
| SCASA | Semiclassical Approxn. Separated Atom |