Hosohedron
Videos
In spherical geometry, an n-gonal hosohedron is a tessellation of lunes on a spherical surface, such that each lune shares the same two polar opposite vertices.
This beach ball would be a hosohedron with 6 spherical lune faces, if the 2 white caps on the ends were removed and the lunes extended to meet at the poles.
Marble floor mosaic Basilica of St Mark Vencice
Regular polyhedron
Videos
A regular polyhedron is a polyhedron with regular and congruent polygons as faces. Its symmetry group acts transitively on its flags. A regular polyhedron is highly symmetrical, being all of edge-tran
The coccolithophore Braarudosphaera bigelowii has a regular dodecahedral structure
The radiolarian Circogonia icosahedra has a regular icosahedral structure
A myovirus typically has a regular icosahedral capsid (head) about 100 nanometers across.
Tetrahedron