|Noun||1.||question mark - a punctuation mark (?) placed at the end of a sentence to indicate a question|
Synonyms: interrogation point
|(character)||question mark - "?", ASCII character 63.|
Common names: query; ITU-T: question mark; ques. Rare: whatmark; INTERCAL: what; wildchar; huh; hook; buttonhook; hunchback.
Question mark is used, along with colon for C's lazy triadic "if" operator (similar to the IIF function in Visual Basic). The expression x?y:z evaluates x, then if x is true it returns y else it returns z.
In Unix shell file name patterns, question mark matches any single character.