Pivot Constraint
The Pivot constraint allows the owner to rotate around a target object. It was originally intended for pivot joints found in humans e.g. fingers, feet, elbows, etc.
Options
Target
Data ID for the selection of the object to be used as a pivot point. See common constraint properties for more information.
Use Relative Offset
Offset will be an absolute point in space instead of relative to the target.
Pivot Point X, Y, Z
Offset of pivot from target.
Rotation Range
Rotation range on which pivoting should occur.
Always
Use the pivot point in every rotation.
-X/-Y/-Z/X/Y/Z Rotation
Use the pivot point in the corresponding direction around the corresponding axis.
Influence
Controls the percentage of affect the constraint has on the object. See common constraint properties for more information.