Exclamation mark (!), a punctuation symbol sometimes called a "bang"
Interrobang (‽), a nonstandard punctuation mark intended to combine the functions of the question mark and the exclamation mark (the latter is known in printers' and programmers' jargon as a "bang")
shebang (Unix), the #! character sequence used to specify an interpreter for a computer program
An onomatopoeia, specifically a word that imitates the sound of an explosion or gunshot, like in comics