Ex. 2a is the established sign for a somersault rotation either way, i.e. either forward or backward.
Logically the symbol for a somersault path (sagittal path) either way should be as Ex. 2b.
The previous decision for the sign for either somersault path was Ex. 2c. Because the symbol for any form of rotation is 2d, logically the symbol for any circular path should be 2e.