I believe there is one wave caused by each leading and trailing edge of the plane's structure.. so there are 5 waves, 1) nose of plane, 2) leading edge of wing,

I believe there is one wave caused by each leading and trailing edge of the plane's structure.. so there are 5 waves, 1) nose of plane, 2) leading edge of wing, 3) trailing edge of wing, 4) leading edge of vert stabilizer, 5) trailing edge of vert stabilizer / back end of the plane.. the angle tells you the mach number it is traveling at.. see here: https://en.wikipedia.org/wiki/Oblique_shock https://en.wikipedia.org/wiki/Oblique_shock