- a mark of punctuation (?) put after a sentence, word, etc. to indicate a direct question, and also used to express doubt, uncertainty, etc.; interrogation mark
- ☆ an unknown factor
- A punctuation symbol (?) written at the end of a sentence or phrase to indicate a direct question. Also called interrogation point.
- Something that is unknown, mysterious, or doubtful: Which players will still be on the team next year remains a question mark.
(plural question marks)
- attributive form of question mark
- question-mark key
question mark - Computer Definition
In C programming, the question mark is used as a conditional symbol. For example, in the expression x1 ? x2 : x3, if x1 is not zero, then x2 is evaluated, otherwise x3 is evaluated.