Small triambic icosahedron
| Small triambic icosahedron | |||||||
|---|---|---|---|---|---|---|---|
| Type | Dual uniform polyhedron | ||||||
| Index | DU30, 2/59, W26 | ||||||
| Elements (As a star polyhedron) | F = 20, E = 60 V = 32 (χ = −8) | ||||||
| Symmetry group | icosahedral (Ih) | ||||||
| Dual polyhedron | small ditrigonal icosidodecahedron | ||||||
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In geometry, the small triambic icosahedron is a star polyhedron composed of 20 intersecting non-regular hexagon faces. It has 60 edges and 32 vertices, and Euler characteristic of −8. It is an isohedron, meaning that all of its faces are symmetric to each other. Branko Grünbaum has conjectured that it is the only Euclidean isohedron with convex faces of six or more sides, but the small hexagonal hexecontahedron is another example.