question mark

Also called interrogation point, interrogation mark. a 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 silver spots shaped like a question mark on the underside of each hind wing.

1865–70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
question mark
1.  the punctuation mark ?, used at the end of questions and in other contexts where doubt or ignorance is implied
2.  this mark used for any other purpose, as to draw attention to a possible mistake, as in a chess commentary
3.  an element of doubt or uncertainty

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Cultural Dictionary

question mark definition

A punctuation mark (?) that follows a direct question: “Is Ralph really seven feet tall?”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

question mark definition

"?", 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.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
He said the question mark after the headline figured in his decision.
It's a cardboard box with a question mark printed on it.
The contents appear as pages with a question mark on them.
The dash, semicolon, question mark and exclamation point go within quotation
  marks when they apply to the quoted matter only.
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