A pyramid.
A pyramid is a triangular 3D shape. A prism can be rectangular too.
Square
tent & pyramid
A square pyramid triangular prism is not a 3-D shape.
It is neither because a square is a 2 dimensional shape whereas a pyramid and a prism are 3 dimensional shapes.
rectangular prism pyramid
A triangular pyramid, square pyramid, triangular prism,rectangular prism,septagonal prism. Anything that has more than corner.
A prism or a pyramid
Triangular Prism, Triangular Pyramid.
pentagonal pyramid triangular prism
A triangle.