| Acronym | Meaning |
| WALTZ | Wonderful Alternating Phase Technique For Zero Residual Splittings |
| APTI | Air Pollution Training Institute |
| TNBS | Trinitrobenzene Sulfonic Acid |
| ALD | Approximate Lethal Dose |
| SCIA | Semiclassical Impulse Approxn. |
| BMDO | Ballistic Missile Defense Organization |
| RAPW | Relativistic Augmented Plane Wave |
| AO | Atomic Orbital |
| AWMA | Air And Waste Management Association |
| POS | Points-on-a-sphere (repulsion Potential Model |