This monograph paper introduces the vector of the body mass inertia moment at the point N for tb:e axis oriented by the unit vector n. The vector is used for interpretation of the rigid body kinetic characteristics. The change of the vector of the rigid body mass inertia moment is determined in the transition from one space point to another when the axis retains its orientation which represents the Huygens-Steiner theorem translated for the defined body mass inertia moment vector. Then the change of the vector of the body mass inertia moment is defined at the given point in the case of the axis changing its orientation in the way analogous to the Cauchy equations in the Elasticity theory. Then the interpretation of the main mass inertia moments asymmetry are defined. The relation between the axis deviation load vector by the body mass inertia moment for the octahedron axis and the inertia mass asymmetry moments axis is analyzed.