<Tr> <Th> Symmetry </Th> <Th> (1, 1, 4) </Th> <Th> (1, 2, 3) </Th> <Th> (1, 3, 3) </Th> <Th_colspan="2"> (1, 4, 3) </Th> <Th> (1, 5, 3) </Th> </Tr> <Tr> <Th> Name </Th> <Th> Square - pyramidal pyramid </Th> <Th> Triangular prism pyramid </Th> <Th> Tetrahedral pyramid </Th> <Th> Cubic pyramid </Th> <Th> Octahedral pyramid </Th> <Th> Icosahedral pyramid </Th> </Tr> <Tr> <Th> Segmentochora index </Th> <Th> K4. 4 </Th> <Th> K4. 7 </Th> <Th> K4. 1 </Th> <Th> K4. 26.1 </Th> <Th> K4. 3 </Th> <Th> K4. 84 </Th> </Tr> <Tr> <Th> Height </Th> <Td> 0.707107 </Td> <Td> 0.790569 </Td> <Td> 0.790569 </Td> <Td> 0.500000 </Td> <Td> 0.707107 </Td> <Td> 0.309017 </Td> </Tr>

What type of pyramid is not a polyhedron