The name of a 10 side polygon is called a decagon.
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In geometry, a decagon is any polygon with ten sides and ten angles. Have more
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Not all shapes have names that are used regularly, but the following do: triangle (3) quadrilateral (4) pentagon (5) hexagon (6) heptagon (7) octagon (8) decagon (10) dodecagon(12
http://www.ehow.com/facts_5859734_fifteen_sidedfi...

A decahedron is a ten sided polyhedron. (3D) A ten sided polygon is a decagon. (2D)
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