Triangular faces (and cross section).
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because triangle is only 2d shape but a prism is 3d shape
They both have sides that are rectangular in shape. They both have a constant cross-sectional shape equal to the shape of the ends (triangle for a triangular prism; rectangle for a rectangular prism).
Their base shape. For example a rectangular prism has base that is a rectangle. Guess what kind of base shape a triangular prism has? yes, triangle.
The shape described is a triangular prism.
A triangular prism would fit the given description