IG1 Full Form. Full Meaning of IG1 Find long form and abbreviation, slang or definition of IG1. What does IG1 mean? What does IG1 stand for? We are providing world largest and most comprehensive acronyms, names, abbreviations database directory on the Internet. Our data base contains more than 8,00,000 terms abbreviations and acronyms. You can also search unique terms more than 4,00,000 general Comprehensive words.