With symbol of a circle with a dot in the center is a" circumpunct"
"Interpret" is a key word, and right now as a look at it, I see the triangle as a symbol of strength and the divine and the circle as a symbol of the infinite - so in short, how the GAOTU in at the center of the infinite. Of course, if you add a point within the circle to make it is circumpunct, then, to me, it represents conduct and with a triangle in the middle, how our moral (perhaps even spiritual and religious) standards should guide our actions.
Thinking on this for a moment - if we take the triangle to represent the GAOTU, that might be Absolute Truth, and if the circumpunct (bearing in mind the Compasses as a working tool) Relative Truth, true because it reflects how we act, or perhaps more comprehension... but then wouldn't the circle be within the triangle ? Maybe the missing dot in the middle is the most interesting element of all because it is within the Circle and the Triangle.