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IGU abbr.
abbr.	International Gangsta Union; International Geographic Union; International Geographical Union
abbr., avia.	Iguassu Falls, PR, Brazil; inlet guide valve
abbr., comp., net., IT	Integrated Gateway Unit
abbr., construct.	insulating glass unit (Insulated Glass Units (IGUs) are manufactured with glass in range of thickness from 3 mm to 10 mm or more in special applications. wiki - АД Alexander Demidov)
abbr., earth.sc.	Iraq Geological Union
abbr., el.	I give up
abbr., geol., scient.	International Geophysical Union
abbr., mil., avia.	inertial guidance unit
abbr., O&G. tech.	International Gas Union
abbr., product.	insulated glass unit (Grudiy)