a prism
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A prism.
It is a prism. More specifically, "A solid figure that has two bases that are parallel, congruent polygons and with all other faces that are parallelograms." This describes the general prism. Replace "polygons" with "triangles" and you have specified a triangular prism.
It is a pentagonal prism
They are prisms.
The faces of Platonic solids are regular polygons...