Rectangle Prisim
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cuboid
a rectangular prism, which is a 3D rectangle.
Rectangles are 2-dimensional figures- they lie in a plane- they have four vertices There really is no such thing as a 3D rectangle. If you mean a rectangular prism, it has 8 vertices, 4 on each of its two parallel faces.
What is the 3d name for octagon
Just that, a "rectangle".