| Acronym | Meaning |
| BO | Born Oppenheimer |
| ETL | Electron Transport Layer |
| EFH | Extended Fenske-Hall (LCAO MO Method) |
| EIP | Eigenvalue-independent Partitioning (in Coupled-cluster Calcns.) |
| IAH | International Association Hydrogeologists |
| EK | Extended Koopmans (method In Ionization Potential Calcns.) |
| IWMIS | INEL Industrial Waste Management Information System |
| PED | Plasma Emission Detector |
| EESL | Environmental Ecological And Support Laboratory |
| RCM | Radiative Convective Model (of Climate) |