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331 model
In particle physics, the 331 model is an extension of the electroweak gauge symmetry from SU(2)_W times U(1)_Y to SU(3)_L times U(1)_X with SU(2)_W subset SU(3)_W and the hypercharge Y = beta T_8 + I X and the electric charge Q=Y/2 + T_3/2 where T3 and T8 are the Gell-Mann matrices of SU(3)L and β and I are parameters of the model. The name 331 comes from the full gauge symmetry group SU(3)_C times SU(3)_L times U(1)_X.
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