Not to trying to be sarcastic, but it's called 3 dimensional artwork. The phrase '3D artwork' is to vague to place a specific label on it since it can cover sculptures, pottery, paintings that have a 3D perspective, digital 3D art, and so on.
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three-dimensional artwork
A pyramid
No. A polygon is a 2-dimensional figure. A polyhedron is 3-dimensional.
3-dimensional, if it's in real life. If it's merely a picture, then it's a 2-dimensional object depicting something that's 3-dimensional.