This quantity is the cross product between the moment arm and the force applied, and it is equal to the moment of inertia times the angular acceleration.
Poinsot's ellipsoid is a construction designed specifically to set this quantity equal to zero. In engineering, a couple is a device that transmits only this quantity. This quantity is produced by the interaction of a magnetic dipole in an external magnetic field, such as the form causing Larmor precession--in general, gyroscopic precession is caused by an off-axis form of this quantity. This quantity is not energy, but it has units of Newton-meters. This quantity is the cross product between the moment arm and the force applied, and it is equal to the moment of inertia times the angular acceleration. For 10 points, name this rotational analogue of force.
Poinsot's ellipsoid is a construction designed specifically to set this quantity equal to zero.
{Torque} [prompt on "tau"]