| Acronym | Meaning |
 | HBJ | Hougen-Bunker-Johns (Hamiltonian For Mol. Calcns.) |
| XUV | Extreme Ultraviolet |
| ACT | Activated Clotting Time |
| IR | Isoprene Rubber |
| RLS | Recursive Least Squares (algorithm) |
| CEIS | Center For Environmental Information And Statistics (EPA) |
| ERDA | Elastic Recoil Detection Analysis |
| QC-SCF | Quadratically Convergent SCF (for Closed-shell Systems) |
| VOIE | Valence Orbital Ionization Energy |
| FOSFA | Federation Of Oils |
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