Linux - Terminal

OS - Terminal (Emulator) (Term|tty) in the context of Linux

• isatty - does this descriptor refer to a terminal
• ttyname, ttyname_r - return name of a terminal

The value of TERM only tells an application program what terminal you are using.

echo $TERM 

xterm

See X11 - Xterm

According to the SSH RFC, the TERM variable is set when initializing the SSH connection. This is set initially, regardless of AcceptEnv. https://tools.ietf.org/html/rfc4254#section-6.2