Icosahedral symmetry: multiple twinning of 20 rhombohedral cells https://www.youtube.com/channel/UCeNplibjHdednjiqUY4IcEg https://www.youtube.com/channel/UCeNplibjHdednjiqUY4IcEg https://www.youtube.com/watch?v=mg1-18jqcbg 1 Shechtman, D., I. Blech, D. Gratias, ...
N represents the counting of twisting for the operation sequence C represents the cyclic periodicity of employing the operation sequence T represents the side of twisting currently RC represents the angle of twisting currently N=,1, C=,1, T ...