| Acronym | Meaning |
| LCMO | Linear Combination Of Molecular Orbitals |
| ESEDD | Excited State Electron Density Differential Method |
| CCWP | Close-coupling Wave-packet (for Mol. Scattering) |
| MAO | Modified Atomic Orbital |
| VPA | Varied Portions Approach |
| LNO | Localized Natural Spin Orbital |
| RCCSD | (spin) Restricted CCSD |
| BO | Biorthonormal (wave Function) |
| PMN | Polymorphonuclear Leukocyte |
| GPR | Ground-penetrating Radar |