pentagonal pyramid
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I believe it is tridecahedron.
3d shapes with six faces are called hexahedra.
In 2 dimensions, a regular 5 sided figure is a pentagon. In 3 dimensions, there is no regular sided 5 sided figure. The tetrahedron is a regular 4 sided figure and a cube is a regular 6 sided figure.
A six sided figure is called a hexagon, as "hex" means "six."
A hexagon is a 6 sided figure