9 12 21 Share definition Flag Meaning " I L U " when converting numbers to lettersA = 1Z = 26 Example :To someone you secretly love : "Hey, 9 12 21!" 9 12 21 by tk154 December 22, 2010 0 0 Get merch Get the 9 12 21 mug. Buy Now — $32.95 See more merch