GY
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| Acronym | Definition |
|---|---|
| Gy | Gray (measure of dose of irradiation; amount of energy transferred to substance being irradiated) |
| GY | Guernsey (postcode, United Kingdom) |
| GY | Guyana |
| GY | Goodyear |
| GY | Gymnasium |
| GY | Grimsby (UK) |
| GY | Gyroscope |
| GY | Grain Yield (agriculture) |
| GY | Geneaology |
| GY | Guyana Airways 2000 (IATA airline code) |
| GY | Guidance Year |
| GY | Vibrational Acceleration Along the Y-Axis |
| GY | Marine Insurance Stamp (Scott Catalogue prefix; philately) |