tty

tty /T-T-Y/, /tit'ee/ n.  The latter pronunciation was
   primarily ITS, but some UNIX people say it this way as well; this
   pronunciation is *not* considered to have sexual
   undertones. 1. A terminal of the teletype variety, characterized by
   a noisy mechanical printer, a very limited character set, and poor
   print quality.  Usage: antiquated (like the TTYs themselves).  See
   also {bit-paired keyboard}.  2. [especially UNIX] Any terminal
   at all; sometimes used to refer to the particular terminal
   controlling a given job.  3. [UNIX] Any serial port, whether or not
   the device connected to it is a terminal; so called because under
   UNIX such devices have names of the form tty*.  Ambiguity between
   senses 2 and 3 is common but seldom bothersome.