"1" in a million a rebus puzzle. Notice the letter "1" is part of the spelling of the word "Million."
The 1 is a one and therefore 1 in a Million or One in an M1llion.
Look out for Heart Sticker owner, Chris Bucci, who is known to slide up to folks and say, "You are one and you know it." Then he'll give you one of these stickers.