| Acronym | Meaning |
| ESD | Environmental Services Division (US EPA) |
| JCAMP | Joint Committee On Atomic And Molecular Physical Data |
| CNDO | Complete Neglect Of Differential Overlap |
| QTPT | Quantum Thermodynamic Perturbation Theory |
| DAU | Drug Abuse Urine |
| HREE | Heavy Rare Earth Element(s) |
| LD-KGC | Linz-Donawitz-Kawasaki Gas Control (steel Converter Furnaces) |
| MAO | Modified Atomic Orbital |
| APM | Acoustic Plate Mode |
| HRATS | High-Rate Anaerobic Treatment Systems |