A spherically symmetric object rotating about any diameter has a constant moment of inertia. If the object has no specific symmetry, it can be rotated about three axes. The moment of inertia about these three axes of rotation is different. Such an object is called an asymmetric top. For example, consider a table tennis racket that can be rotated about three rotational axes. The moment of inertia about these three rotational axes measures how mass is distributed around each. It is easier to rotate the table tennis racket about the axis of rotation for which the moment of inertia is the smallest, which means that for a given amount of torque, the racket will acquire maximum angular velocity about this axis of rotation. For the axis about which the moment of inertia is maximum, the racket rotates slowly. The racket's rotation is stable about these two axes of rotation, but becomes unstable when rotated about the intermediate axis of rotation.