The NACA 4- and 5-digit codes provide a geometric indication of the shape of an aerofoil section although the 5-digit methods are a little more complex.
http://www.aa.nps.navy.mil/~jones/on...s/panel2/naca/ provides an easy to follow description.
There is any number of sites which allow you to draw and play with the section profiles if you wish to do so ..... have fun ...