This is an example of radial 3-D symmetry.  The model is a hollow sphere made with solid elements.  The mesh on the left is before morphing; the mesh on the right is after morphing.  The icon for radial 3-D symmetry is a cone with its vertex at the origin of the symmetry system. The highlighted handle is moved.  Note how the handles act on the mesh as if they were rays extending away from the origin.  This type of symmetry is very useful for making radial changes to spherical objects.