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A = cross sectional area (in^2 or cm^2 for metric)
Ix = moment of inertia about the x (horizontal/strong) axis (in^4 or cm^4 for metric) Iy = moment of inertia about the y (vertical/weak) axis (in^4 or cm^4 for metric) http://en.wikipedia.org/wiki/Second_moment_of_area
Sx = Section Modulus about the x axis (in^3 or cm^3 for metric) Sy = Section Modulus about the y axis (in^3 or cm^3 for metric) http://en.wikipedia.org/wiki/Section_modulus