The measure of the quantity of motion possessed by a body in rotational motion is called angular momentum.
The angular momentum of a body about an axis is the product of its linear momentum and the perpendicular distance of the body from the axis.
In other words
The angular momentum of a body is equal to cross product of its
linear momentum and the vector distance from the axis of rotation.
Magnitude of Angular momentum
We know that m r2 is equal to moment of inertia i.e. I = m r2
Unit of angular momentum
In S.I. System unit of angular momentum is "joule.second".
Dimension of angular momentum