| Acronym | Meaning |
| EBEBO | Extended Bond Energy Bond Order (quantum Calcn. Method) |
| IRS | Internal Reflection Spectroscopy |
| IDLH | Immediately Dangerous To Life Or Health |
| SEHRS | Surface-enhanced Hyper-Raman Scattering |
| HRAC | Herbicide Resistance Action Committee |
| AWFCO | Automatic Waste Feed Cutoff |
| IIA | Information Industry Association |
| QCISDT | Quadratic CI (with) Single (and) Double (and) Triple (excitations) |
| RAPW | Relativistic Augmented Plane Wave |
| ECR | Eriochrome Cyanine Rpar |