teletype, a combination keyboard, printer and modem.
Typically with a paper tape punch and reader to save long-distance costs.
Connections were typically made at 300 baud (bits per second) or 6 characters per second, the speed of a fast typist.
TTY access is generally available to government services for the benefit of the hearing impaired.
Acronymically pronounced: Titty. Used in a sentence: Glass TTYS replaced paper TTYS only to have, more recently, been replaced by plasma, LCD, LED, and OLED, and tiny, little TTYS you can hold in your hand called iPhones as well as other G4 and G5 compatible devices.