Are you sure it is a Logo? Sorry if this comment is too obvious, but if it is near a test point or wire connection it may be intended to identify telecommunication, especially if there is no known supplier using that logo. On Wed, 13 Jun 2018 13:58:32 +0000, [log in to unmask] wrote: >Fellow TechNetters: > > Is anyone out there familiar with the PWB symbol of " TTY "? I don't have a pic of the symbol just the letters. > >Victor,