| Acronym | Meaning |
| PICI | Positive-ion Chemical Ionization |
| GLEAMS | Groundwater Loading Effects Of Agricultural Management Systems |
| PPAD | Parallel-plate Avalanche Detector |
| GLAS | Geoscience Laser Altimeter System |
| AIEMP | Ab Initio Environment Model Potential |
| AVA | Anthrax Vaccine Adsorbed |
| EXELFS | Extended Energy-loss Fine Structure |
| DELCD | Dry Electrolytic Conductivty Detector |
| GDP | Gross Domestic Product |
| REX | Relativistically Parametrized Extended Hueckel |