| Acronym | Meaning |
| IPNSO | Independent-pair Natural Spin Orbital |
| OVB | Orthogonalized Valence Bond Method |
| DRPA | Direct Random Phase Approximation |
| CPMP | Committee For Proprietary Medical Products |
| ILCT | Intraligand Charge-transfer |
| NOSC | Naval Ocean Systems Center |
| LOA | Linear Optical Amplifier |
| ASDWA | Association Of State Drinking Water Administrators |
| CPBA | Coulomb-projected Born Approximation |
| NBS | Nuclear Backscattering Spectroscopy |