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I've been pondering that question for awhile now actually, and I wasn't able to figure that out until just now after rethinking it.

I knew I had seen it some where. It is a 7 sided polyhedron which puts it in the general category called a heptadedron. 7 is an extremely sacred number in many traditions. However, I found out that it is more specifically called a Chestahedron.

The Chestahedron is the first heptahedron of this configuration in the history of geometry. This sculpture has 7 surfaces (consisting of 4 triangles and 3 quadrilaterals), 7 points and 12 edges. If this heptahedron is rotated around the vertical axis, it forms a bell-like external surface of a certain profile: a cone at the top connected to a hyperbolic at the bottom. Other type heptahedra, or less-faced polyhedra do not provide a bell-type figure. For this reason it is supposed that the Chestahedron in rotation is the first geometrical bell shape form ever found and therefore it is the first time the mystery behind the geometry of the bell has been solved in the history of bell making. It has been found in years of research that this geometry is the basis of the left ventricle of the human heart. The midway point between the idea of the human heart and the manifestation of the human heart. Naming the Chestahedron came from the heart being the dominant organ in the chest.

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Now the real question is why did they choose this symbol for EOS and what is it's metaphysical meaning in sacred geometry? Below are some links I found after a quick search for the metaphysics. Please share if you figure more out.
What is a Chestahedron? – Sacred Geometry
Chestahedron: The Magic Of The Heart Sacred Geometry
Remarkable Seven Sided Form Part I: the Magical Heart

Thanks for the upvote and inspirational question. I don't know if I would have figured this out if you hadn't asked me. Consider Resteeming or Following if you find this information helpful :)

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