!!

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

  • A brilliant move in chess notation
  • The double factorial operator in mathematics
  • A "convert to Boolean" construction in some computer languages
    • This is through a computer type of double negation, where its Boolean value is negated, then negated again, converting the value to either true or false
  • An operator for fetching list elements 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[edit]