| Abbreviation | Definition |
|---|---|
| GB | Gravity Bomb |
| GC | Gamma Corrected |
| GC | Geometrical Correction |
| GCA | Gradual Channel Approximation |
| GCFC | Generalized Complementary Flux Condition |
| GCK | Geiger Counter Kit |
| GCMS | Gas Chromatograph Mass Spectrometer |
| GCR | Gapped Conserved Regions |
| GD | Good Deformation |
| GDOG | Generalized Double Optical Gating |
| GDT | Gas Discharge Tube |
| G-E | Grazing-Exit |
| GEC | General Electrodynamics Corporation |
| GEM | Graviton Electro Magnetic |
| GEMS | General Electro Magnetic Solvers |
| GEMS | Glottal Electromagnetic Micropower Sensor |
| GEOS | Geosynchronous Earth Orbit Satellite |
| GERDA | The GERmanium Detector Array |
| GF | Gravity Force |
| GFAAS | Graphite furnace atomic absorption spectrophotometry |