$\displaystyle J_{m}(x) = \sum^{infnty}_{s=0} \frac{(-1)^{s}x^{m+2s}}{2^{m+2s}s!(m+s)!}$

What do m and s physically mean in the bessel function?

I.e.

In maple,

This corresponds to $\displaystyle {\chi}^{s}_{m}$

where s = 3, m = 5

What do s and m mean though?

Thanks