The object's center point
Every object has a center point.
It may not be where you expect it to be.
The center point is the origin where the three axes join with respect to that object's viewpoint.
The case for the cube shown in Figure 1 and Figure 2 is straightforward.
The center point of the cube is at the exact center of the cube.
However, the center point for a penguin is at a point in space on the ground midway between the penguin's feet.