I'm not sure what's so cool about that.
Ugh. UGH! UUUUUGGGH! *slaps Joe with a frying pan*
Blizzard doesn't allow numbers or capital letters (except at the beginning of a name) by default.
Actually, if you transfer characters and your name is already taken, it generates random numbers and letters at the end of your name. I thought it was funny to randomly get 69FACE.