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This is a simple 9 sided die.
It's a lat-long polyisohedron, an order 3 polyisohedron. Though this shape has 27 sides, only 9 of them are stable, each of which appear with equal probability. The numbered sides are offset from the other sides so it's easy to read the result of a roll.
For more information on unique dice shapes, see http://loki3.com/poly/fair-dice.html.