"Rotates" edges by cycling their endpoints around the vertices of their two adjacent polygons.
To apply:
Select some edges.
Choose Modify Poly. Mesh Spin Edges.
To continue cycling, choose the command again or open the SpinEdge Op property editor and adjust the Spin value.
To redisplay
Select the polygon mesh object then choose Selection and click the SpinEdge Op icon.
Spin
The number of times to cycle the endpoints. Negative values cycle in the opposite direction.