This icon determines whether or not the probe will move along an arc as opposed to usually moving in a straight line when moving from one hit to the next. This option is particularly helpful when working with ring grooves.
This icon is available for these Auto features: Circle, Cylinder, Cone, Sphere, and Plane. For a Plane feature, it becomes available if you are using a radial pattern for the feature's hits.
For information on how to insert circular moves into the Edit window, see "Inserting a Move Circular Command" in the "Inserting Moves" chapter.