Reply To: unknown symbol
I apologize for not responding to your question earlier.
I have never seen that symbol before and I don't believe there is a Code symbol for it. My suggestion would be to create a shape (such as [braille]$tv) and define it as "two lines in a plane cut by a transversal". Depending on how often it is used, you would either place the tn at the site, or list it on the special symbols page.