1. 
   IGU
   acronym: International Geographical Union (ICSU)
   Found op http://cdiac.ornl.gov/pns/acronyms.html#I
   
   
2. 
   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 op http://www.britannica.com/eb/a-z/i/7
   
   
3. 
   IGU
   (chat) I Give Up. Often found appended to documents, e-mail, programs that don't work, etc. (1999-09-30)
   Found op http://foldoc.org/IGU
   
   
4. 
   igu
   1) International geographical union
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/igu/1
   
   

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