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- 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 negative, 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
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