| Acronym | Meaning |
| AED | Atomic Emission Detector |
| CGRO | Compton Gamma-Ray Observatory |
| MFS | Molecular Fluorescence Spectroscopy |
| NTO | Natural Transition Orbital Method (for Excited States) |
| SGCR | Subcommittee Global Change Research |
| MEMOSA | Microelectromechanical Optical Sensor Array |
| ECNI | Electron Capture Negative Ionization |
| GDAAS | Glow Discharge Atomic Absorption Spectrometry |
| SOP | Second-order Potential (method For Positron-atom Scattering) |
| REM | Reservoir Eutrophication Model |