TTD
Stands for Telecommunication Device for the Deaf.
In the U.S., TDD is governed by Title IV of the Americans with Disabilities Act. All telephone companies are required to provide telecommunication relay services by dialing 7-1-1 to reach a telecommunications relay service, abbreviated as TRS, after which an assistant can place a call using the 10-digit number on the caller’s behalf. The caller can then use a TDD to speak to the party on the other end of the call and read the response.
For more information on the laws governing TDD, see the FCC.
TDD is a commonly used abbreviation. On first reference in news stories use TDD, which is short for Telecommunication Device for the Deaf. On all subsequent references and outside of news stories, use TDD.
The <abbr> code for TDD is:
<abbr title="Telecommunication Device for the Deaf">TDD</abbr>
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