| Acronym | Meaning |
| T-GAS | Trace Gas Accounting System |
| ECPA | European Crop Protection Association |
| KADP | Kentucky Acid Deposition Program |
| QLSM | Quadratic Least-squares Method (variational For Scattering) |
| ACT | Alternative Control Technique |
| UOVMO | Unoccupied Valence-type Mol. Orbital |
| RADREM | Radioactivity Research And Environmental Monitoring Committee |
| ACF | Autocorrelation Function |
| NBS | National Bureau Of Standards |
| AEA-MO | All-electron Approxn.-mol. Orbital |