A pyramid.
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A triangular prism has two triangular faces, a rectangular prism does not have any.
A triangular prism.
A triangular prism has a triangular cross-section. A rectangular prism has a rectangular cross-section.
You can have a triangular prism but not a triangular cuboid which is a rectangular shape.
A triangular prism can have a square or triangular base, but faces are normally triangles. (I think)