List of rotational symmetry polyhedral sets
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There are an unlimited number of polyhedral sets which can be defined with rotational symmetry.
This list shows the some of the simplest sets which appear within the convex uniform polyhedra, Johnson solids and related duals.
Each set has one polyhedral for each polygon, and each is prefixed by its generating polygon: triangular, square, pentagonal, hexagonal, etc. Some have degenerate (linear) forms as well where the symmetry has collapsed to an edge.
There's three symmetry classes:
- Cnv - n-fold pyramidal symmetry
- Dnh - n-fold prismatic symmetry
- Dnv - n-fold antiprismatic symmetry
Set | Symmetry | V | E | F | Example(s) | Dual set |
---|---|---|---|---|---|---|
Pyramids | Cnv | n+1 | 2n | n+1 | Pentagonal pyramid |
Self-dual |
Frustums (Truncated pyramids) |
Cnv | 2n | 3n | n+2 | (Pentagonal frustum) |
-- |
Cupolae | Cnv | 3n | 5n | 2n+2 | Pentagonal cupola |
-- |
Prisms | Dnh | 2n | 3n | n+2 | Pentagonal prism |
Bipyramids |
Bipyramids | Dnh | n+2 | 3n | 2n | Octahedron |
Prisms |
-- | Dnh | 3n+2 | 6n | 3n | Rhombic dodecahedron -- |
(below) |
-- | Dnh | 3n | 6n | 3n+2 | Cuboctahedron |
-- |
Bifrustums (Truncated bipyramids) |
Dnh | 3n | 5n | 2n+2 | Pentagonal bifrustum |
Elongated bipyramids |
Elongated dipyramids | Dnh | 2n+2 | 5n | 3n | Elongated hexagonal dipyramid J14, J15, J16 |
Bifrustums |
-- | Dnh | 5n | 8n | 3n+2 | -- |
(below) |
-- | Dnh | 3n+2 | 8n | 5n | -- | -- |
Orthobicupolae | Dnh | 4n | 8n | 4n+2 | J27, J28, J30 |
(below) |
Dual orthobicupolae | Dnh | 4n+2 | 8n | 4n | Orthobicupolae | |
Antiprisms | Dnd | 2n | 4n | 2n+2 | Pentagonal antiprism |
Trapezohedra |
Trapezohedra | Dnd | 2n+2 | 4n | 2n | Pentagonal trapezohedron |
Antiprisms |
Truncated trapezohedra | Dnd | 4n | 6n | 2n+2 | Dodecahedron (Truncated pentagonal trapezohedron) |
Gyroelongated dipyramids |
Gyroelongated dipyramids | Dnd | 2n+2 | 6n | 4n | Icosahedron (Gyroelongated pentagonal dipyramid) (J17) |
Truncated trapezohedra |
Gyrobicupolae | Dnd | 4n | 8n | 4n+2 | Cuboctahedron (Triangular gyrobicupola) J29, J31 |
(below) |
Dual gyrobicupolae | Dnd | 4n+2 | 8n | 4n | Rhombic dodecahedron |
Gyrobicupolae |