- a punctuation mark indicating a question: usually, as in English, the mark (?) placed after a question.
- something unanswered or unknown: His identity is still a question mark to most of us.
- an anglewing butterfly, Polygonia interrogationis, having a silver marking that resembles a question mark on the underside of each hindwing.
- the punctuation mark ?, used at the end of questions and in other contexts where doubt or ignorance is implied
- this mark used for any other purpose, as to draw attention to a possible mistake, as in a chess commentary
- an element of doubt or uncertainty
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