Definition
Each surface has a local tab known as a Pivot. A pivot is a surface's attachment point. It is generally positioned at the origin of the surface's local axes and it indicates the orientation of the axes. Local axes are used when you wish to group surfaces and move the group together, or when you are preparing an animation.
If the 
Pivot tab is active in Shaper, the pivot of a surface is visible when the surface is selected.
A pivot of a surface.