2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89865We establish the quantum stationary Hamilton-Jacobi equation in 3-D and its solutions for three symmetrical potentials, Cartesian symmetry potential, spherical symmetry potential and cylindrical symmetry potential. For the two last potentials, a new interpretation of the Spin is proposed within the framework of trajectory representation.12 pages, LaTex, no figuresQuantum Physicstext