What is the meaning of !?

Denoting excitement, surprise, shock or sudden realizations.

  1. Expresses excitement, anger or other emotion.

    Expresses excitement, anger or other emotion.

    Replacing a period at the end of a declarative sentence.

    Following a question mark at the end of an interrogative sentence.

    At the end of an interjection that is set off by dashes or parentheses.

    In parentheses, see (!).

    Used between words to add emphasis to an exclamation or imperative.

    Used in some comics instead of the period (.), ending all sentences, except those that use question marks, ellipses, etc.

    Used by itself to convey that a character is surprised at something.

    Used to convey that a character has made a sudden realization.

    Placed after a herbarium abbreviation to indicate that the mentioned material held there has been examined directly by the author.

    Used to join a descriptor, such as a trait, with its referent, usually a character or relationship.

    The factorial: the result of a multiplication of all integers from 1 to the given number.

    Indicator of a good move.

    A Boolean negation, the not operator, serving to invert the truth value of what follows.

    Formerly used as a separator between hostnames in an e-mail address for the purpose of routing a message (called bang path notation).

    Used as a separator between a user's nickname and ident.

    In glosses, marks a word as imperative.

    Used at the end of a salutation line of a letter.

    Source: wiktionary.org