  Baryon triality (B3) is a Z3 discrete symmetry that can protect the proton
from decay. Although its realization does not require supersymmetry, it is
particularly appealing in the supersymmetry as an alternative to the popular
R-parity. We discuss the issues in gauging B3, and present the minimal
supersymmetric model with B3 as the remnant discrete symmetry of a TeV scale
U(1) gauge symmetry. A flavor-dependent U(1) charge is necessary to achieve
this, and it results in very distinguishable and flavorful predictions for the
LHC experiments. We find a complementarity between a 2-lepton sneutrino
resonance and a 4-lepton Z' resonance in the supersymmetry search. In addition,
we introduce baryon tetrality (B4), which would play an equivalent role if
there are four fermion generations.
