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.
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a pyramid is a 3D shape :)
is a square a 3d shape
Paper is a 3D object.
A 3d shape can have infinite sides
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