Definition: Pyramidoprism is a type of fractal created by tessellating a flat surface into an infinite number of triangles and other geometric shapes. Each side of this pyramidoprism forms a triangle that has all its sides equal to the length of one of the edges of the original flat surface, forming a regular polygon. The number of sides in a pyramidoprism can be as large as 1024 or more, depending on how many triangles are needed to form each side.