For those really intense questions. Pairs with "Double Exclamation Mark" Emoji. This emoji had a very short life, it was added in iOS 5 and removed in iOS 6.
Emoji History The emoji code/ image log of changes.
This emoji first appeared in OSX / iOS after the iOS 5 update.
The code generated for this emoji was changed slightly in iOS 7 / OSX 10.9 (a variation selector was added) advising the OS to display character emoji style instead of black and white text when available. We don't mind Apple, thank you! We just love our emojis! [Sources 11438-emoji-var.pdf 13.7 Variation Selectors (unicode.org)]