What part of an object is used when listing its global position? And it’s position is from 0, 0, 0?
I believe it is the center of the model’s bounding box, the white corner lines shown when you select an object.
Click an object, select the Move command, the red, green, and blue axes will intersect at the object origin.
World coordinates are measured from the front left corner of the plate (0,0,0).