Source : Free On-Line Dictionary of Computing

uparrow
     
         The graphic which the 1963 version of {ASCII} had
        in place of the {caret} character, {ASCII} 94.
     
        (1995-03-06)

\uparrow
     
         An upward pointing arrow in {LaTeX}.
     
        See {closure}.
     
        (1995-03-16)