| Acronym | Meaning |
| ICF-CI | Interacting Correlated Fragment-CI (wave Function) (see Also SA-MCSCF) |
| HHH | Henon-Heiles Hamiltonian |
| OMO | Orthonormal Molecular Orbital |
| NABSA | Nucleic Acid Based Sequence Amplification |
| ENCS | Existing And New Chemical Substances |
| SESAO | Semiempirical Scaled Atomic Orbital |
| PIPLC | Phosphatidylinositol Phospholipase C |
| LEACH | Leaching Evaluation Of Agricultural Chemicals |
| FPC | Federal Power Commission |
| BIF | Banded Iron-formation |