The heptagram also relates to the seven chakras of the body. These are the energy nodes that rise up the course of the spine from the basal node, where is coiled the Kundalini serpent, to the point at the top of the head. The mundane well-being of the body and its aura are linked to the chakras. The heptagram is symbolic of this balanced, flowing of bodily energies and of health. It is a symbol relating to healing and dynamic balance of the body physic.
A Calabi-Yau manifold is a special type of manifold that shows up in certain branches of mathematics such as theoretical physics. Particularly in superstring theory, the extra dimensions of spacetime are sometimes conjectured to take the form of a 6-dimensional Calabi-Yau manifold.