question mark

punctuation mark (?) placed at the end of a sentence to indicate a question, interrogation point

The question mark (?), also known as an interrogation point, question point, query, or eroteme, is a punctuation mark that replaces the full stop at the end of an interrogative sentence. It can also be used mid-sentence to mark a merely interrogative phrase, where it functions similarly to a comma, such as in the single sentence "Where shall we go? and what shall we do?", but this usage is increasingly rare. The question mark is not used for indirect questions. The question mark character is also often used in place of missing or unknown data.
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Noun
1. a punctuation mark (?) placed at the end of a sentence to indicate a question
(synonym) interrogation point
(hypernym) punctuation, punctuation mark

<character> "?", 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.
(2003-06-17)

Synonyms and related words:
Chinese puzzle, baffling problem, bone of contention, brain twister, catechism, cross-interrogatory, cross-question, crossword puzzle, crux, debating point, demand, enigma, enigmatic question, feeler, floorer, inquiry, interrogation, interrogative, interrogatory, issue, jigsaw puzzle, knot, knotty point, leader, leading question, mind-boggler, moot point, mystery, nut to crack, perplexed question, perplexity, point at issue, point in question, poser, problem, puzzle, puzzlement, puzzler, query, question, question at issue, quodlibet, sixty-four dollar question, sticker, stumper, topic, tough proposition, trial balloon, vexed question, why