### Question
How is the "TTY" defined?


### Answer
The term **TTY** is defined in *40 U.S.C. § 18101* as follows -

> a text-telephone used in the transmission of coded signals through the nationwide telecommunications system

#### Citation:
  - *40 U.S.C. § 18101*
  - Heading: **SUBTITLE VI-MISCELLANEOUS > CHAPTER 181-TELECOMMUNICATIONS ACCESSIBILITY FOR HEARING-IMPAIRED AND SPEECH-IMPAIRED INDIVIDUALS**

