Two. All prismatic shapes have two bases.
a circle
Prisms.
It is simply a shape which has two bases which are regular polygons. There is no special name for such shapes.
prism and cylinder
prisms
It is a prism with non-polygonal bases. The bases simply be two identically shaped "blobby" shapes.
Trinagle
A cylinder has two parallel congruent faces and a curved surface.
Bases are faces but faces are not necessarily bases.
There are infinitely many such shapes. There are infinitely many such shapes. There are infinitely many such shapes. There are infinitely many such shapes.
Prisms are classified according to the shape of the two congruent and parallel plane shapes which form its bases.