Heptagonal prism.
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There are 9 sides on a triangular prism.
Sides = Faces: 9 Edges: 21.
does a rectangle prism have 6 sides
A square prism has six sides
A heptagon is a 7-sided polygon, so a heptagonal prism is a 3D version of that (9 sides, 21 edges, 14 vertices).