As you can see, Ravignat calls this “The Jewel of a Sovereign Prince of the 88th Degree” of Memphis Misraim. Unfortunately he gives no source for the image. In the ritual the image is described as:
a gold four pointed star or square on which is superimposed another square in the middle of which is a point
Also see Double Square with Circle and Dot and Double Square with Circle, Dot and Moon.
Ravignat p. 327