A big red question mark.
question mark definition by Webster's New World
- 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
question mark definition by American Heritage Dictionary
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.
question mark - Cultural Definition
A punctuation mark (?) that follows a direct question: “Is Ralph really seven feet tall?”