The suffix "hedron" implies 3D.
The 2D suffix is "gon"
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A television set is a 3D shape. The image (picture) on the television screen is a 2D shape. 3D is when it has length, width, and height. 2D is only length and width.
A piece of paper is 3D.
A 12 sided 3D shape is called a dodecahedron.
dodecahedron
Dodecahedron