btwo Vitamin also known as riboflavin Vitamin also called riboflavin U.S. stealth bomber (usually written with a numeral, but how about a little creative license?) Stealth plane Stealth bomber, familiarly Riboflavin's number Riboflavin's designation Riboflavin, alternatively Really expensive bomber Kind of bomber Riboflavin, familiarly Vitamin a.k.a. riboflavin USAF stealth plane Stealth bomber Call in a bingo hall ___ Spirit (stealth bomber) Vitamin that's also a plane