Architecture student. Test question.?

Question

Hi, I'm a student working on a study guide for my architecture class. It includes building as well as landscape. I've gotten most of the answers except this has me stumped:

What is the name of an intersection where three roads emanating from one central point within a 45 degree angle making it possible to view all of the roads at the same time?

Could somebody please provide the name for that? The test mostly has to do with ancient European Landscape Architecture.

Thanks.

Answer 1

come again?