At low temperature, this quantity equals its value at absolute zero times the expression “1 minus temperature over critical temperature raised to the three-halves power.” Between Bloch domains, this vector rotates continuously about the normal of the Bloch wall plane. The volume bound current density equals (-5[1])the curl of this quantity. This quantity is the order parameter of the Ising model, (10[1])in which it spontaneously emerges (-5[1])as temperature is decreased in a phase transition. The H-field equals the B-field divided (10[1])by the permeability of free space minus this quantity. (10[1])When increasing the applied field no longer increases this quantity, a ferromagnet has become saturated. For 10 points, name (-5[1])this vector defined as the magnetic (10[1])dipole moment per unit volume, (-5[1])the magnetic analog of electric polarization. ■END■ (10[1]0[8])