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In 2-d, the naming of polygons is such that a 10 sided shape is a decagon. Even if it is a 5-pointed star shape, it is a decagon. A concave decagon (rather than convex) but still a decagon.

In 3-d, a decahedron, possibly, with the term "sides" being used for "faces".

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Q: What is a shape with ten sides and not a decagon?
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