GI may stand for:

• Galvanized Iron
• Gastrointestinal, a division of the human anatomy in medicine
• Generic identifier
• Geodætisk Institut, a former Danish cartographic institute
• Geographical indication
• Game Informer, a video games magazine
• Government issue, meaning army enlisted personnel
• Government Issue, A 1980's Hardcore Band
• G.I. Joe, a toy soldier series manufactured by Hasbro
• (GI), an album by influential punk band The Germs
• Gibraltar: FIPS PUB 10-4 territory code and ISO country code
• Global illumination, in 3D computer graphics, the rendering of light in 3D scenes
• Global income
• Glycemic index, a ranking system for carbohydrates based on their effect on blood glucose levels
• Graded index
• Grand Island, Nebraska, an American city
• Graph isomorphism problem and the complexity class of problems reducible to it

Gi may stand for: Galvanization refers to any of several electrochemical processes named after the Italian scientist Luigi Galvani. ... For the Physics term GUT, please refer to Grand unification theory The gastrointestinal or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and... Geodætisk Institut (1928-1987) was a Danish state-run cartographic institute. ... A geographical indication (sometimes abbreviated to GI) is a name or sign used on certain products or which corresponds to a specific geographical location or origin (eg. ... March 2006 issue of Game Informer. ... Government Issue (often just GI) were an American straight edge hardcore punk band originating from the Washington DC scene, formed in 1980 and signed to Dischord Records. ... Government Issue (often just GI) were an American straight edge hardcore punk band originating from the Washington DC scene, formed in 1980 and signed to Dischord Records. ... Classic G.I. Joe Adventure Team Image, circa 1973 G.I. Joe is a cartoon soldier created by David Breger when he was asked to do a comic strip for United States military magazines during World War II. Breger came up with the title G.I. Joe from the military... (GI) is the lone studio album from influential American punk band The Germs. ... Federal Information Processing Standard (FIPS) two-letter country codes (FIPS 10-4) are used by the US Government for data processing, and in the CIA World Factbook. ... ISO country code can refer to ISO 3166-1 for countries that currently exist ISO 3166-1 alpha-2 ISO 3166-1 alpha-3 ISO 3166-1 numeric ISO 3166-3 for countries that do not exist anymore Generally, its the two letter country code of ISO 3166-1... Global illumination algorithms used in 3D computer graphics are those which, when determining the light falling on a surface, take into account not only the light which has taken a path directly from a light source (direct illumination), but also light which has undergone reflection from other surfaces in the... Glycemic Index The Glycemic Index (also glycaemic index, GI) is a ranking system for carbohydrates based on their immediate effect on blood glucose levels. ... Grain elevator along the Union Pacific Railroad in downtown Grand Island Grand Island is a city located in Hall County, Nebraska. ... In computational complexity theory, the graph isomorphism problem or GI problem is the graph theory problem of determining whether, given two graphs G1 and G2, it is possible to permute (or relabel) the vertices of one graph so that it is equal to the other. ...

• Keikogi or "Gi" for short, the clothing worn in judo, karate, and other Japanese martial arts.
• Gi (Captain Planet character), a character in the television series Captain Planet and the Planeteers
• Gilbert (Gb or Gi), a former CGS unit of magnetomotive force or magnetic potential

gi may stand for: Keikogi (稽古着 or 稽古衣) is a Japanese word which means Uniform for training (Keiko means practice, gi means dress or clothes). ... Gi is a character in the animated series Captain Planet and the Planeteers. ... Gilbert is a masculine name of Germanic origin. ...

• .gi: Gibraltar's country code top-level domain
• Gill, a U.S. customary unit equal to 4 U.S. fluid ounces (never used) and an Imperial unit equal to 5 imperial fluid ounces (rarely used, also known as a noggin)