| Acronym | Meaning |
| PCS | Photon Correlation Spectroscopy |
| MOCIC | MO Constraint Of Interaction Coordinates |
| RTPM | Radical Triplet Pair Mechanism |
| ACE-I | Angiotensin Converting Enzyme Inhibitor |
| ICC | Interstate Commerce Commission |
| DIBP | Diisobutyl Phthalate |
| APFU | Atoms Per Formula Unit |
| SRMCASE | Symmetry-restricted Multiconfiguration Annihilation Of Single Excitations Method |
| FVEH | Fragment Valence Effective Hamiltonian (in Electronic-structure Calcns. On Mol. Fragments) |
| ACSI | Accelerated Strategic Computing Initiative (for Fusion Reactor) |