::!!

Number::boolean    Double::negated    Computer::operator    Value::click    Haskell::unicode    Language::southern

{{#invoke:Side box|main}} ‼ (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

The ‼ character can be typed on Microsoft Windows operating systems by using the key combination ALT+19, or in simple form, holding the ALT key and typing the numbers 1 and 9 on the number pad.

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