Gy

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

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