D18 Sphere This is a Truncated Sphere D18.
The numbering has been done very carefully. Of course, numbers on opposite faces sum to 19. This leads to the fact that the 8 numbers around any of the 3 diameters sum to 76. But the dificulty has been the have the 6 numbers surrounding a spherical zone to sum to 57. It works for all the 8 zones (for instance, in the rendering - the brown one - you can see: 18 + 3 + 13 +11 + 7 + 5 = 57).
See this thread for more informations.
Available Truncated Sphere Dice: D1, D3, D4, D5, D6, D7, D8, D9, D10, D%, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D24, D32, D33
Alternative shapes: alt D6 (3-fold), alt D7 (2-fold), alt D8, 3-fold D10 (rounded), 3-fold D10 (pointed), 4-fold D10, 5-folded D10 (pointed), Optimal D11, alt D24 (snub)
Coming soon: D21, D22, D23, D50
Related dice: Concave D4, Concave D6, D3 Shell, D4 Shell, D6 Shell, D8 Shell.
A mass-produced version is now available for $2 at Impact! Miniatures: