| Acronym | Meaning |
| IEG | Immediate Early Gene |
| HLR | Hydraulic Loading Rate |
| THFFF | Thermal Field-flow Fractionation |
| VLBI | Very Long Baseline Interferometry |
| SEGS | Solar Electric Generating System |
| RCRIS | Resource Conservation And Recovery Information System |
| MQES | Metastable-quenched Electron Spectroscopy |
| CRISM | Compact Reconnaissance Imaging Spectrometer For Mars |
| IIRF | Intergalactic IR Radiation Field |
| CLIC | Compact LInear Collider |