A pyramid.
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A pyramid
The flat surfaces on a pyramid are called faces. A pyramid has one base and triangular faces that meet at a single point called the apex. On a cube or rectangular prism, the flat surfaces are called faces as well. But unlike a pyramid, a cube has six square faces, while a rectangular prism has two rectangular bases and four rectangular faces.
Triangular prism is one and another one is the rectangular prism
A triangular prism that is sitting on one of its rectangular faces MUST have a slanted top!
There are five of them. One at each corner of the rectangular base, and the fifth at the apex where the triangular faces meet.