What does the Y stand for in TTY?

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3. What is TTI full form?
4. What does PB stand for in science?
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6. What is mean by TTY mode?
7. What does TYYY mean on Snapchat?
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Tags

1. #sometimes
2. #telephone
3. #however
4. #order
5. #conversation
6. #stands
7. #accepted
8. #communicate
9. #telecommunication
10. #device
11. #people
12. #required
13. #called
14. #widely