exclamation mark

noun

1. the sign (!) used in writing after an exclamation.
2. this mark sometimes used in writing two or more times in succession to indicate intensity of emotion, loudness, etc.: Long live the Queen!!
3. this mark sometimes used without accompanying words in writing direct discourse to indicate a speaker’s dumbfounded astonishment: “His wife just gave birth to quintuplets.”(!)

noun

1. the punctuation mark ! used after exclamations and vehement commands
2. this mark used for any other purpose, as to draw attention to an obvious mistake, in road warning signs, (in chess commentaries) beside the notation of a move considered a good one, (in mathematics) as a symbol of the factorial function, or (in logic) occurring with an existential quantifier