Source : Free On-Line Dictionary of Computing

CTY
     
        /sit'ee/ or /C-T-Y/ [MIT] The terminal physically associated
        with a computer's system {console}.  The term is a contraction
        of "Console {tty}", that is, "Console TeleTYpe".  This {ITS}-
        and {TOPS-10}-associated term has become less common, as most
        Unix hackers simply refer to the CTY as "the console".
     
        [{Jargon File}]