Thoughtful Gifts for Curious People
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The disdyakis triacontahedron, which has the most faces among the Archimedean and Catalan solids - and the most faces a die can have and still be usable. The edges form 15 great circles, and the die is perfectly numerically balanced: opposite faces always add up to 121, and the sum of every group of 10, 6, or 4 numbers around each vertex is the same for all groups of the same type.
Measure 50mm in diameter