Look up !! in Wiktionary, the free dictionary.

‼ (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 exclamation of joy, although it is incorrect grammar.

Double exclamation mark is present in Unicode as U+203C.

[edit] See also

• !!!
• ! (disambiguation)

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