I'm trying to find better terms for particular nodes.
Elbows
I have started using the term elbow instead of corner stone. Corner stone didn't sound right, as it could refer to particular positions on the board.
The term elbow nodes or elbow position more sound like referring to the graph theory that I'm attempting to use here.
I'm still short of a good term for the other nodes in a square. Any suggestions? Straight, Opposite, Unbend? Or Body, Arm?