  A new approach to the study of the AGN phenomenon is proposed, in which the
nucleus activity is related to the metric of the inner massive black hole. The
possibility of a Toroidal Black Hole (TBH), in contrast to the usual Spherical
Black Hole (SBH), is discussed as a powerful tool in understanding AGN related
phenomena, such as the energetics, the production of jets and the acceleration
of particles, the shape of the magnetic field and the lifetime of nucleus
activity.
