An octagonal prism is one possibility.
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Triangular prisim. The three faces are rectangles, while the two bases are triangles.
They are prisms.
were two or more faces of a solid figure
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.
Polygonal faces.