Assertion: octahedron | /r/HasAspect | dihedral symmetry
Facets:
Source sentences:
text: Octahedron will usually imply regular octahedron with octahedral symmetry, while a (Th) tetragonal bipyramid (or especially square bipyramid), being in the bipyramid family, would more likely to be considered to have only dihedral symmetry.