Teletypewriter or Teletype, a typewriter with an electronic communication channel

Teletypewriter as a common name for telecommunications device for the deaf (TDD)

Tampereen teknillinen yliopisto, the Finnish name for Tampere University of Technology

A short term used online meaning "talk to you later." Associated with TTYL.

A generic term for any computer data terminal or associated serial interface

tty, a Unix command that outputs the name of the current terminal. This is equivalent to the string that would be returned by the ttyname(3) library function.