The Free On-line Dictionary of Computing (30 December 2018):

question mark
?
ques

    "?", 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)