| Acronym | Meaning |
 | PIMS | Process Information Management System |
| NPSSMO | Nonpaired Spin Spatial Molecular Orbital |
| IDDB | Investigational Drugs Database |
| DWBE | Distorted-wave Born (approxn. With) Exchange |
| AQS | Air Quality Standard |
| WDA | Weighted-density Approxn. (within D. Functional Formalism) |
| OAPP | Oxidized Atactic Polypropylene |
| ACSI | Accelerated Strategic Computing Initiative (for Fusion Reactor) |
| STCA | Simplified Traveling-cluster Approxn. (for Electronic Structure) |
| NCS | Notification Of Compliance Status |
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