It looks like a pup tent.
The two parallel ends of the shape are triangles and the faces that connect these are parallelograms, usually rectangles.
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a triangular prism has a triangle for the bottom and has 3 faces like a pyramid
a piece of a very thick cake would be in the shape of a triangular prism so if you take a thick cake and cut it into regular sized pieces, the shapes of the pieces would be triangular prism
That sounds like a triangular prism.
envelope
A triangular prism has 6 verticies