The /etc/ttytype file associates termcap(5) and terminfo(5)
terminal type names with tty lines. Each line consists of a
terminal type, followed by whitespace, followed by a tty name (a
device name without the /dev/ prefix).
This association is used by the program tset(1) to set the
environment variable TERM to the default terminal name for the
user's current tty.
This facility was designed for a traditional time-sharing
environment featuring character-cell terminals hardwired to a
UNIX minicomputer. It is little used on modern workstation and
personal UNIX systems.