Look up Gy in Wiktionary, the free dictionary.
GY, Gy, or gy may refer to:
Units of measurement
- Gray (unit) (Gy), SI unit of absorbed radiation
 - Giga-year, 1,000,000,000 years (non-SI)
 - Galactic year, the time it takes for the Solar System to orbit the Galactic Center
 
People
- Pierre Gy (1924–2015), French chemist and statistician
 - Garin de Gy, 14th century Catholic Master of the Order of Preachers
 
Places
- Gy, Switzerland, a village in the Geneva canton
 - Guyana (ISO country code: GY)
- .gy, the country code top level domain (ccTLD) for Guyana
 
 - GY postcode area for Guernsey, Alderney and Sark
 - Gy, Haute-Saône, a commune in the Haute-Saône département of France
 - Great Yarmouth, United Kingdom
 - Grimsby, United Kingdom
 
Transport
- GY, a Mazda automotive piston engine
 - Gabon Airlines (IATA code: GY)
 - Tri-MG Intra Asia Airlines's IATA code
 
Other uses
- Hungarian gy, an alphabetic digraph
 - gy, a digraph in the Tibetan pinyin transliteration system
 - GenCorp (GY NYSE symbol)
 - Green Youth (disambiguation), one of two Green party youth wings
 - Grapevine yellows, a plant disease
 - Gy, the on-line charging interface in the GPRS core network
 
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