| Acronym | Meaning |
| NHOMO | Next Highest Occupied Molecular Orbital |
| EDL | Electric Double Layer |
| NCTR | National Center For Toxicological Research |
| WHPA | Wellhead Protection Areas |
| BLS | Bare Lymphocyte Syndrome |
| VRIOSA | Vibrational/rotational Infinite-order Sudden Approximation |
| NDOL(ND0-L) | Neglect Of Differential Overlap-azimutal Quantum Number (of Valence Ao's) |
| ACIOSA | Adiabatic Capture Infinite Order Sudden Approximation |
| PSEP | Polyhedral Skeletal Electron Pair (for Metal Clusters) |
| AFPR | Alliance Of Foam Packaging Recyclers |