Final answer:
A TTY (Text Telephone) is the terminal device with a keyboard and display which sometimes includes a printer, used primarily by the deaf and hard of hearing.
Step-by-step explanation:
The terminal device with a keyboard and display and sometimes with a printer that is being described is known as a TTY (Text Telephone). This device is specifically designed for the deaf and hard of hearing to communicate over phone lines using typed messages. It features a keyboard for typing messages and a display for reading incoming messages. Some models include a printer for printing out a transcript of the conversation.