When you have masses distributed about a rotational axis, what is the terminology for the center of mass about the central rotational axis? I don't believe I am referring to "moment of inertia" or "radius of gyration" since both of those use radius squared.

In this example image, https://i.imgur.com/Z72ZP5T.png, the center of mass defined traditionally is at the origin (0,0,0). However, if I am doing a calculation of how much centrifugal force the masses would exert when rotating, the equation is mass * radius * (rotational speed)^2 where the expected radius would be the radius R of the circular arrangement. Is there a term for that "center of mass"? Is it just "center of mass in cylindrical coordinate system" or is there a more succinct term?