a pyramid
A polygonal pyramid.
A Rectangular Pyramid.
pyramid
If it has a square base, one. Squares don't crop up all that often.
a pyramid
Such a figure is a pyramid.
Pyramid
How about a cone or a pyramid
There are many possibilities, one of which is an octagonal pyramid.
How about a cone or maybe a pyramid
pyramid
A polygonal pyramid.
a pyramid
Yes
A square pyramid
Pyramid.