D13 Sphere This is a Truncated Sphere D13. It has a 4-fold symmetry.
This die is inspired by the repulsion force polyhedra. But in this case, the underlying polyhedron (not rounded) does not exactly look like the shape that can be obtained through this technique with 13 points repulsing each others.
Instead, I calculated the positions of those points to have a maximal radius for the circles resulting from the intersection of this underlying polyhedron with a sphere. The result is a truncated sphere with 13 circular faces of same radius.
See this thread for more informations.
Available Truncated Sphere Dice: D4, D6, D7, D8, D9, D10, D%, D11, D12, D13, D14, D15, D16, D17, D18, D20, D24, D32, D33
Alternative shapes: alt D8, 3-fold D10 (rounded), 3-fold D10 (pointed), 4-fold D10, 5-folded D10 (pointed), Alt D24 (snub)
Coming soon: D22, D50
Related dice: Concave D4, Concave D6, D4 Shell, D8 Shell.