IGU

acronym: International Geographical Union (ICSU)
Found on http://cdiac.ornl.gov/pns/acronyms.html#I

Igu

(from the article `Dibng Valley`) ...in the Dibng Valley region is largely undeveloped. Most distances are traveled over simple tracks, though there are a few all-weather roads. Anini ...
Found on http://www.britannica.com/eb/a-z/i/7

igu

i give up
Found on http://www.noslang.com/dictionary/i/
No exact match found