Octahedron
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a polyhedron (if the shape is 3 dimensional) a polygon if it is a planar shape.
A 5-sided 2-dimensional figure is a pentagon and a 5-sided 3-dimensional shape is a pentahedron.
If it's a 2-dimensional shape, like lines drawn on paper, a 12 sided shape is called a dodecagon. If it's 3-dimensional, like a 12-sided die, then it's called a dodecahedron.dodecagon
For the word' object' , do you mean a 2-dimensional shape, or a 3-dimensional solid. 2-dimensional ; is a nonagon 3-dimensional ; is a nonahedron.
A pyramid