A polygonal pyramid.
There are many but I guess that the answer that you are looking for is a pyramid.
It is a polygonal pyramid.
triangular prism
A pyramid is a solid figure with one vertix.
Such a figure is a pyramid.
A polygonal pyramid.
a polygonal prism or a polygond
A polygon is a many sided 2-dimensional figure, and thus could never be "solid" Alternatively, it could be "one face that is a polygon". In that case the solid could be like a pyramid that morphs into a cone or a part-sphere. The base would be the one polygon, the other face would not.
Pyramid, base
If I am correct I'm sure any pyramid does now if you knew what shape the base is or how many triangle faces I could answer
a pyramid
Polygonal Prism Actually, it is a polygonal pyramid. A polygonal prism would have two polygonal faces.
A geometric figure with a polygonal base and triangular sides is called a pyramid.
It could be a pyramid.
It can be a triangular based pyramid
There are many but I guess that the answer that you are looking for is a pyramid.