A teleprinter is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations.

What TTY means?

Yes. The TTY (TeleTYpe), TDD (Telecommunications Device for the Deaf), and TT (Text Telephone) acronyms are used interchangeably to refer to any type of text-based telecommunications equipment used by a person who does not have enough functional hearing to understand speech, even with amplification.

What is TTY on cell phone?

When TTY (teletypewriter) settings are enabled, you can use your phone with a TTY device if you're deaf or hard of hearing.