GI
- Gi – (s) Gibi
- GI – (i) Galvanised Iron – Gastro-Intestinal – General Issue – (s) Gibraltar (ISO 3166 digram; FIPS 10-4 territory code) – (i) Government Issue
- GIB – (s) Gibraltar (ISO 3166 trigram)
- GIF – (a) Graphics Interchange Format (pronounced "jif")
- GIG – (a) Global Information Grid
- GIGO – (a) Garbage In Garbage Out (computing)
- GIMP – (a) GNU Image Manipulation Program
- GIN – (s) Guinea (ISO 3166 trigram) – (a) Guidelines International Network
- GINK - Going Insane Not Knowing - orig. Colorado 2010 M.Kalfas
- GINO – (a) Godzilla In Name Only
- GIP – (s) Gibraltar pound (ISO 4217 currency code)
- GIS – (i) Geographic Information System – (i) Google Image Search
- GISS – (a/i) General Impression of Size and Shape – Goddard Institute for Space Studies
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