Lists of uniform tilings on the sphere, plane, and hyperbolic plane
In geometry, many uniform tilings on sphere, euclidean plane, and hyperbolic plane can be made by Wythoff construction within a fundamental triangle, (p q r), defined by internal angles as π/p, π/q, and π/r. Special cases are right triangles (p q 2). Uniform solutions are constructed by a single generator point with 7 positions within the fundamental triangle, the 3 corners, along the 3 edges, and the triangle interior. All vertices exist at the generator, or a reflected copy of it. Edges exist between a generator  point and its image across a mirror. Up to 3 face types exist centered on the fundamental triangle corners. Right triangle domains can have as few as 1 face type, making regular forms, while general triangles have at least 2 triangle types, leading at best to a quasiregular tiling. There are different notations for expressing these uniform solutions, Wythoff symbol, Coxeter diagram, and Coxeter's t-notation. Simple tiles are generated by Möbius triangles with whole numbers p,q,r, while Schwarz triangles allow rational numbers p,q,r and allow star polygon faces, and have overlapping elements. 7 generator  points. The seven generator points with each set of formula_1 (and a few special forms): There are three special cases: Symmetry triangles. There are 4 symmetry classes of reflection on the sphere, and three in the Euclidean plane. A few of the infinitely many such patterns in the hyperbolic plane are also listed. (Increasing any of the numbers defining a hyperbolic or Euclidean tiling makes another hyperbolic tiling.) Point groups: Euclidean (affine) groups: Hyperbolic groups: The above symmetry groups only include the integer solutions on the sphere. The list of Schwarz triangles includes rational numbers, and determine the full set  of solutions of nonconvex uniform polyhedra. In the tilings above, each triangle is a fundamental domain, colored by even and odd reflections. Summary spherical, Euclidean and hyperbolic tilings. Selected tilings created by the Wythoff construction are given below. Spherical tilings ("r" = 2). Some overlapping spherical tilings ("r" = 2). Tilings are shown as polyhedra. Some of the forms are degenerate, given with brackets for vertex figures, with overlapping edges or vertices. Dihedral symmetry ("q" = "r" = 2). Spherical tilings with dihedral symmetry exist for all formula_9 many with digon faces which become degenerate polyhedra. Two of the eight  forms (Rectified and cantillated) are replications and are skipped in the table. Euclidean and hyperbolic tilings ("r" = 2). Some representative hyperbolic tilings are given, and shown as a Poincaré disk projection. Euclidean and hyperbolic tilings ("r" > 2). The Coxeter–Dynkin diagram is given in a linear form, although it is actually a triangle, with the trailing segment r connecting to the first node.