A pentagonal heptahedron.
A heptahedron is a solid figure with seven faces, and a pentagon is a five-sided plane figure.
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That shape is called a triangular prism. A prism is made of rectangles arranged in a tube with any 2D shape at the ends. This shape determines what kind of prism it is, you can get pentagonal, hexagonal, and many other types of prism.
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. The number of perpendicular faces will depend on which particular octahedron you have in mind. The heptagon-based pyramid, for example, has none.
it is a decogonanon it is a decogonanon
triangular prisom
Hexagon based prism