rhombic symmetry
41Demihypercube — Not to be confused with Hemicube (geometry). Alternation of the n cube yields one of two n demicubes, as in this 3 dimensional illustration of the two tetrahedra that arise as the 3 demicubes of the 3 cube. In geometry, demihypercubes (also… …
42Compound of three octahedra — The compound of three octahedra In mathematics, the compound of three octahedra or octahedron 3 compound is a polyhedral compound formed from three regular octahedra, all sharing a common center but rotated with respect to each other. Although… …
43Wallpaper group — A wallpaper group (or plane symmetry group or plane crystallographic group) is a mathematical classification of a two dimensional repetitive pattern, based on the symmetries in the pattern. Such patterns occur frequently in architecture and… …
44quasicrystal — /kway zuy kris tl, kway suy , kwah see , zee /, n. a form of solid matter whose atoms are arranged like those of a crystal but assume patterns that do not exactly repeat themselves. [1985 90] * * * Introduction also called quasi periodic crystal …
45Order-3 bisected heptagonal tiling — Type Dual semiregular hyperbolic tiling Faces Right triangle Face configuration V4.6.14 …
46Density of states — Condensed matter physics Phases · Phase tr …
47Penrose tiling — A Penrose tiling is a nonperiodic tiling generated by an aperiodic set of prototiles named after Roger Penrose, who investigated these sets in the 1970s.Because all tilings obtained with the Penrose tiles are non periodic, Penrose tilings are… …
48Compound of five octahedra — Type Regular compound Index UC17, W23 Elements (As a compound) 5 octahedra: F = 40, E = 60, V = 30 …
49Disphenoid — The tetragonal and digonal disphenoids can be positioned inside a cuboid bisecting two opposite faces. All four faces are isosceles triangles. Both have four equal edges going around the sides. The digonal has two sets of isosceles triangle faces …
50Rectangle — Family Orthotope Type Quadrilateral Edges and vertices 4 Schläfli symbol {}x{} …
