| Acronym | Meaning |
| ETB | Extended Tight-binding (method For Electronic-structure Calcns.) |
| PPBA | Plane-wave Plane-wave Born Approximation |
| ATRP | Atom Transfer Radical Polymerization |
| ELRA | Enzyme-linked Receptor Assay |
| NERC | North American Electric Reliability Council |
| THFA | Target Hartree-Fock Approximation |
| ILWAS | Integrated Lake Water Acidification Study |
| AAV | Adeno-associated Virus |
| QAT | Quality Assurance Technical Materials |
| QC-SCF | Quadratically Convergent SCF (for Closed-shell Systems) |