This 14-sided die is based on the shape of a cuboctahedron, but the 8 equilateral triangle faces have been replaced with hexagons. Each hexagonal face has roughly the same area as each square faces. Suggested dice numbering scheme: Reserve the square faces for the high/low values 1, 2, 3, 12, 13, 14.
I also sell a numbered version
of these D14 dice.