The orbital symmetry of the superconducting order parameter in UPt3 is identified by evaluating the directionally dependent thermalconductivity and ultrasound attenuation in the clean limit and compared with the existing data for both basal plane and the c-axis of a hexagonal crystal. The resulting two component orbital part expressed by (λx(k), λy(k)) is combined with the previously determined triplet spin part, leading to the order parameter of either the non-unitary bipolar state of the form: d(k) = ˆ bλx(k) + i ˆ jλy(k) or the unitary planar state of the form: d(k) = ˆ bλx(k) + ˆ jλy(k) wherê b ⊥ ˆ j = ˆ c, orâorˆorâ with the hexagonal unit vectorsâvectorsˆvectorsâ, ˆ b andˆcandˆ andˆc. The d vector is rotatable in the plane spanned byâbyˆbyâ andˆcandˆ andˆc perpendicular tô b under weak applied c-axis field because of the weak spin orbit coupling. Experiments are proposed to distinguish between the equally possible these states.