The Heptagon is a seven pointed star. It is not a platonic solid.
The Satanist and founder of the OTO, which stands for Ordo Templi Orientis, Aliester Crowley also used a heptagon in his occult ceremonies and ritual magic practices.
Steffi Grant, member of the occult group OTO, used the Heptagon in an occult painting "Vault of the Adepths"
Each point\circle\monument of the heptagon correlates to one of the 7 planets known to ancient man and were considered physical manifestations of celestial intelligence.
The Jefferson Memorial corresponds with one of the 7 planets known to ancient man, the Sun. It also lines up with the summer solstice line via Maryland Avenue.
Within a Heptagon there is a six pointed star called a a Hexagram. The Hexagram is used in ritual magic for evoking and banishing of spirits.
The Hexagram is easily recognizable within the Israeli Flag.
With a Heptagon is a five pointed start called a Pentagram. In ritual magic, the pentagram is also used to evoke and banish spirits.
