A decagon.
A two-dimensional shape (plane figure, or polygon) which has ten sides is a decagon.
A three-dimensional shape (polyhedron) which has ten sides (plane faces) is a decahedron.
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A shape that has 10 sides (two dimensional) is called a decagon. A shape that has 10 faces (three dimensional) is call a decahedron.
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Adecagon.