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This is an unusual 3D projection (shadow) of the 4D Vector Equilibrium (also known as the Octoplex, Hyperdiamond, and 24 cell). It clearly shows its signature hexagonal shape. There are 24 vertexes, of which 4 are on the central axis. It could also be called the 4D hexagon.
This 40mm size is very nice for wearing, however because the lines are so fine it can only be manufatured in certain materials. The gold enrobed versions are of course very nice, but the raw brass has improved to the point that it is hard to tell it apart from the gold enrobed, and much cheaper! There are larger versions available. Lg 50mm - Xlg 60mm
This is one of the 6 four dimensional Platonic forms. In 4D it has other unique properties, such as that it can tile space without rotation like a cube, but is not a cube, and it is its own dual like a tetrahedron, but it is not a tetrahedron.