FK5 Full Form. Full Meaning of FK5 Find long form and abbreviation, slang or definition of FK5. What does FK5 mean? What does FK5 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.