A Cache of Symbols: Familiar, Archetypal, Universal
Geometric shapes have been used to represent aspects of nature and the universe for millenia. Even today they are the basic tools for science, architecture, design and art.
The diameter represents the division between the upper and lower waters of Creation. The double triangle also represents Creation with the inverted triangle being the 'yin' aspect, and the upright triangle being the 'yang' aspect. The square divided into four equal parts is an ancient Chinese symbol for Earth.