Categories Glossary TTY Post author By faq Post date 2020-06-23 No Comments on TTY Teletypewriter: also known as a TDD (Telecommunications Device for the Deaf) Related posts: Certification Mark What is a trademark and a service mark? ← TTAB → TW@H Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.