Hybridization of square planar complex is dsp‌p2. Structure of square planar complex ⟶
In square planar complex all 4 surrounding atoms and central atom are in the same plane and let this plane is x−y plane. As it is dsp‌p2 hybridized, so it has 1d orbital, 1s orbital and 2p orbital. s orbital is non-directional, so we just write it as s.
In px the two lobes are along x-axis and in py two lobes are along y-axis One d orbital is dx2−y2, it means out of four lobes of d orbital two along x-axis and two along y-axis.