| Acronym | Meaning |
| SCF2 | Two-electron Self-consistent Field |
| SDO | Shielded Diatomic Orbital |
| BPC | British Pharmaceutical Codex |
| RMS | Root Mean Square |
| CSA | Centrifugal Sudden Approxn. (in Scattering Calcns.) |
| ESD | Environmental Services Division (US EPA) |
| RMCL | Recommended Maximum Contaminant Level |
| CCR | Complex Coordinate Rotation (method For Calcns. Of Resonances In Scattering) |
| DARC | Dielectric Antireflection Coating |
| HWTC | Hazardous Waste Treatment Council |