We construct the first three family N = 1 supersymmetric string model with
standard model gauge group SU(3)(C) x SU(2)(L) x U(1)(Y) from an orientifol
d of type IIA theory on T-6/(Z(2) x Z(2)) and D6-branes intersecting at ang
les. In addition to the minimal supersymmetric standard model particles, th
e model contains right-handed neutrinos, a chiral (but anomaly-free) set of
exotic multiplets, and extra vectorlike multiplets. We discuss some phenom
enological features of this model.