Source : WordNet®

question mark
     n : a punctuation mark (?) placed at the end of a sentence to
         indicate a question [syn: {interrogation point}]

Source : Free On-Line Dictionary of Computing

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.
     
        (2003-06-17)