What does TDD stand for?

The term TDD stands for Telecommunication Device for the Deaf. This device was designed to enable individuals with hearing impairments to communicate over the telephone by typing text messages, which are then transmitted through the phone line. TDD systems utilize a keyboard and a display and allow for two-way communication, facilitating access to phone services for users who are deaf or hard of hearing.

This technology plays a crucial role in accessibility, ensuring that those who cannot rely on traditional voice communication can still connect with others effectively. The importance of accurate terminology is underscored by the historical context of these devices and the evolution of communication technology for individuals with disabilities.

While other options may include similar wording, they lack the specific term "Telecommunication," which is central to the function and purpose of TDD. The other options diverge in terminology which does not accurately represent the established name of this device.