| Acronym | Meaning |
| C4S | Chemical Shift-specific Slice Section |
| TRI-US | Toxic Release Inventory-User Support |
| GVB-INIT | Generalized Valence Bond-initial (guess Wave Function) |
| ECE | Electrical Conductivity Of Saturation Extract (soils) |
| STODI | Slater-type Orbital-point Dipole Interaction (in Mol. Polarizability Calcns.) |
| TPR | Temperature-programmed Reduction |
| GSM | Global System For Mobile Telecommunications |
| COPNA | Condensed Polynuclear Aromatics |
| GDIM | Generalized Diatomics-in-molecules (theory) |
| RAS | Reflection-absorption Spectroscopy |