TTY stands for "TeleTYpewriter." A teletypewriter is basically a keyboard with a small screen and a couple of cups that the ends of an (old fashioned) phone handset sets down into.
It is occasionally called a TDD, which stands for "Telecommunication device for the Deaf."
Some government types tried to call it a TT (text telephone) for a while, but it never caught on. (chuckle)But here in the Deaf community, we call it a TTY.
TTY
For more information see the TTY discussion page.
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