| Acronym | Meaning |
| GBS | Generalized Bohr-Sommerfeld (quantization Method) |
| MNDO | Modified Neglect Of Differential Overlap |
| IMS | Incomplete Model Space (in Many-body Calcns.) |
| VIP | Vibronic Impact Parameter (model For Mol. Scattering) |
| MSM | Multiple-scattering Model |
| RRS | Resonance Rayleigh Scattering |
| BEEM | Ballistic Electron Emission Microscopy |
| UOP | Universal Oil Products |
| BCOE | Barrels Of Crude Oil Equivalent |
| AGA | American Gas Association |