(a double exclamation mark) may refer to:

• A brilliant move in chess notation
• The double factorial operator in mathematics
• A "convert to Boolean" pseudo-operator in some computer languages
  • This is through a computer type of double negative, where its Boolean value is negated, then negated again, converting to the value to either true or false
• An operator for getting the n-th element of a list in the programming language Haskell
• A retroflex click, a family of click consonants found only in Juu languages of southern Africa and in the Damin ritual jargon of Australia

See also

• !!!
• ! (disambiguation)

de:!! es:!! eo:!! fr:!! ko:!! it:!! ru: zh:!!