TTY

Abbreviation for teletypewriter.

A type of machine that allows people with hearing or speech disabilities to communicate over the phone using a keyboard and a viewing screen. It is sometimes called a TDD.

A TTY (teletypewriter) is a communication device used by people who are deaf, hard-of-hearing, or have severe speech impairment. People who don't have a TTY can communicate with a TTY user through a message relay center (MRC). An MRC has TTY operators available to send and interpret TTY messages.

teletypewriter: also known as a TDD (Telecommunications Device for the Deaf)

Teletype.