Source : Free On-Line Dictionary of Computing

STD
     
        1. {state transition diagram}.
     
        2. {Internet} standard.
     
        A subseries of {Request For Comments} (RFC) that specify
        {Internet} {standard}s.  The official list of Internet
        standards is {STD 1}.
     
        See also {For Your Information}.
     
        {rfc.net (http://www.rfc.net/)}.
     
        (1994-11-30)