!1

Etymology
From +, from the fact that usually the same key is used for both symbols. Shift + 1 = !. This indicates that the person released Shift at some point, thus beginning to type 1.

Punctuation mark

 * 1)   dramatization of the ! punctuation
 * You'd all burn and go to hell!!!!!!!!!!!11111
 * You'd all burn and go to hell!!!!!!!!!!!11111