A 3-d object is often called a model.
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A 12 faced object or solid
The object's dimensions. Multiplied together they give the objects volume.
Well, a 2D object has only length and width, but a 3D object has length, width, and depth.
Paper is a 3D object.
A 'hedron' from Latin. Hence 'polyhedron' a many sided three dimensional object.