Rotational kinetic energy: Rotational kinetic energy is the energy associated with an object's rotation. It depends on both its moment of inertia and angular velocity.
Radius of gyration: The radius of gyration represents how far away from an axis an object's mass could be concentrated while still having the same moment of inertia.
Parallel-axis theorem: The parallel-axis theorem states that if you know an object's moment of inertia about one axis, you can calculate its moment of inertia about another parallel axis using a simple formula.