| Acronym | Meaning |
| RCI | Restricted Configuration Interaction |
| LHON | Leber's Hereditary Optic Neuropathy |
| ATG | Derivative Thermal Anal. |
| MCH | Mean Cell Hemoglobin |
| E-2PH-TDA | Extended Two-particle-hole Tamm-Dancoff Approxn. (green-function Method For Ionization-energy Calcns.) |
| EPICA | European Project For Ice Coring In Antarctica |
| SR-CCSD | Single Reference-CCSD |
| SOMO | Singly Occupied Molecular Orbital |
| NOAO | National Optical Astronomy Observatories |
| SCF | Supercritical Fluid |