7.2.130 ui-center-origin

(ui-center-origin [origin|bbox-center])

Set the origin of the coordinate system of the CENTER object for user interface (i.e. mouse) controlled motions. The keyword origin means to use the origin of the coordinate system of the currently selected object, while bbox-center means to use the center of the bouding box of the current object. The keyword bbox-center makes no sense if the geometry is non-Euclidean. Using either bbox-center or origin does not make a difference if the center object is not a geometry, e.g. if it is a camera. Same holds if the World is the currently selected object.