well actually it is a prism.
If you mean a 5 sided pyramid with the 6 side being the bottom it would be called a Pentagonal Pyramid
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A pentagonal pyramid.
A cone by definition has only two sides. A five-sided pyramid can refer to either a square-based pyramid (four angled sides and the base) or a pentagonal-based pyramid (five visible sides).
A pyramid
A 5-sided polygon is called a pentagon.
A five sided geometric shape is called a pentagon.