A tetrahedron, but you can also think of it as a pyramid.
-edit: actually it would be a pentahedron, which may look like a four sided pyramid in which you can see the bottom, or it may look like a triangular prism. Tetra- four, Penta- five.
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An five sided shape is called a Pentagon
a five sided shape in geometry is called a pentagon
A five sided shape is called a pentagon.
A regular 5-sided shape is called a pentagon.
A five sided geometric shape is called a pentagon.