The moment of area, also known as area moment of inertia. Real mm4 to cm4 (square millimeters to square centimeters).
Moment of inertia — a scalar physical quantity, the measure of inertia in rotational movement around the axis, just as the mass of a body is a measure of its inertia in translational motion. Is characterized by the distribution of mass in the body: moment of inertia equal to the sum of products of elementary masses by the square of their distances to the base set (point, line or plane).