l = Azimuthal (or) Angular momentum quantum number.
l defines the subshell.
(s, p, d, f)
value of l = n-1
ml = magnetic quantum number.
Magnetic orbital quantum number. ‘ml ’ gives information about the spatial orientation of the orbital with respect to the standard set of co-ordinate axis.
(px, py, pz , s, dxy etc.)
value of m = -l to +l