semisymmetric group

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Semi-symmetric graph — In mathematics, a semi symmetric graph is an undirected graph that is edge transitive and regular, but not vertex transitive.In other words, a graph is semi symmetric if each vertex has the same number of incident edges, and there is a symmetry… … Wikipedia
Chiral polytope — A snub cube comes in two mirror image chiral copies, shown here as alternations of a great rhombicuboctahedron In mathematics, a polytope P is chiral if it has two orbits of flags under its group of symmetries, with adjacent flags in different… … Wikipedia

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