G.I.
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GI (G.I.), Gi or gi may refer to:

Entertainment

• Game Informer - a video game magazine
• Gi (Captain Planet character) - a character in the television series Captain Planet and the Planeteers
• G.I. Joe - a toy soldier series manufactured by Hasbro
• G.I. (comics) - a reference to Genetic Infantryman in the Rogue Trooper fictional universe

Science and measurement

• Galvanized iron - iron that has been electrochemically rustproofed with zinc
• Gastrointestinal - a division of the human anatomy in medicine
• GenInfo Identifier - a database key in the NCBI's Genbank database
• Geodætisk Institut - a former Danish cartographic institute
• Geographical indication
• Geophysical Institute - a research institution at the University of Alaska Fairbanks
• GI (complexity) - complexity class of the Graph Isomorphism Problem
• Gill - a U.S. unit of volume equal to 4 U.S. fluid ounces and an Imperial unit equal to 5 imperial fluid ounces
• Global illumination - the rendering of light in 3D computer graphics scenes
• Global income
• Glycemic index - a ranking system for carbohydrates based on their effect on blood glucose levels
• Graded index
• Granuloma inguinale - an alternate name for donovanosis, a bacterial infection
• Graph isomorphism problem and the complexity class of problems reducible to it
• Gibi or Gi - the IEEE prefix that represents 2³⁰
• Gilbert (Gb or Gi) - a former CGS unit of magnetomotive force or magnetic potential

Sport and martial arts

• Martial Arts gi (more correctly, the keikogi or dogi) - the traditional training uniform worn in Japanese martial arts. Examples include the judogi, the karategi, the aikidogi, and the jujutsugi.
• Group I (also written Grade I or Group 1) - in horse racing, younger horses generally represented by the lower number. Listings 1-3 usually Roman numerals.

Music

• (GI) - an album by The Germs
• Garage Inc, album by thrash metal band, Metallica
• Government Issue - a 1980s DC Hardcore Punk band

Places

• Gary, Indiana - a city in Northwest Indiana
• Grand Island, Nebraska - an American city
• Green Island, New Zealand - a town in New Zealand's South Island
• .gi - Gibraltar's country code top-level domain
• Gibraltar

Other

• GI (military) or G.I. - a nickname for a United States Army soldier
• Global Indicator - used in determining the route for journeys
• Gi - an alternative name for Chaac, a Mayan god
• Generic identifier - a string constituting the name of an element in an SGML document
• General Instrument - an electronics company
• Itek Air - IATA airline designator
• Goethe-Institut - the German cultural affairs body

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