Regular Star Polygons

{7/3}

Inside the {7/3} star wwhich is colored red, there is a {7/2} star which is colored blue.

The {7/2} star is commonly used by law enforcement agencies in the orientation which you see it here.

Inside the {7/2} star is a yellow {7/1} star or regular septagon.

Since 7 is a prime number, all of these stars are simple.