a 3D shape has 3 dimensions; length, with and depth
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3d stands for '3-dimensional', meaning that the shape has three parametres (or directions) for its space, usually translated as it has length, width, and height.
A dodecahedron is a three-dimensional shape with 12 pentagonal sides.
A 'hedron' from Latin. Hence 'polyhedron' a many sided three dimensional object.
Like 3D. Looks like you can hold it. It's not flat
Forgive me if I am mistaken of what you are asking, but i believe you either mean the spelling of: Three Dimensional Shape OR Prism