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Interrobang: a punctuation mark that combines the question mark (interrogative point) and the exclamation mark (writer's slang - bang); the two are superimposed over one another.

The interrobang is commonly used when expressing question and disbelief simultaneously. While ‽ is the correct character of the interrobang (note the exclamation mark overlaps the the ligature of the question mark), writers often use ?! in its place due to its scarce inclusion in word processing character sheets and its obscurity in general.