!!

‼ (a double exclamation mark, Unicode character U+203C) may refer to:


 * !! (chess), a brilliant move in chess annotation
 * Double factorial, an operator in mathematics
 * Retroflex click, a family of click consonants found only in Juu and Namibian languages, and in the Damin ritual jargon
 * Double-negation translation, !!p = p.