  In this paper we propose the quantized spin Hall effect (SHE) in the vortex
state of a rotating p-wave paired Fermi system in an inhomogeneous magnetic
field and in a weak periodic potential. It is the three dimensional extension
of the spin Hall effect for a 3He-A superfluid film studied in Ref. [1]. It may
also be considered as a generalization of the 3D quantized charge Hall effect
of Bloch electrons in Ref. [2] to the spin transport. The A-phase of 3He or,
more generally, the p-wave paired phase of a cold Fermi atomic gas, under
suitable conditions should be a good candidate to observe the SHE, because the
system has a conserved spin current (with no spin-orbit couplings).
