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2. List of planar symmetry groups - Wikipedia

   en.wikipedia.org/wiki/List_of_planar_symmetry_groups

   This article summarizes the classes of discrete symmetry groups of the Euclidean plane. The symmetry groups are named here by three naming schemes: International notation, orbifold notation, and Coxeter notation. There are three kinds of symmetry groups of the plane: 2 families of rosette groups – 2D point groups; 7 frieze groups – 2D line ...

3. Symmetry (geometry) - Wikipedia

   en.wikipedia.org/wiki/Symmetry_(geometry)

   A drawing of a butterfly with bilateral symmetry, with left and right sides as mirror images of each other.. In geometry, an object has symmetry if there is an operation or transformation (such as translation, scaling, rotation or reflection) that maps the figure/object onto itself (i.e., the object has an invariance under the transform). [1]

4. Symmetry - Wikipedia

   en.wikipedia.org/wiki/Symmetry

   An object has reflectional symmetry (line or mirror symmetry) if there is a line (or in 3D a plane) going through it which divides it into two pieces that are mirror images of each other. [6] An object has rotational symmetry if the object can be rotated about a fixed point (or in 3D about a line) without changing the overall shape. [7]

5. List of spherical symmetry groups - Wikipedia

   en.wikipedia.org/wiki/List_of_spherical_symmetry...

   There are five fundamental symmetry classes which have triangular fundamental domains: dihedral, cyclic, tetrahedral, octahedral, and icosahedral symmetry. This article lists the groups by Schoenflies notation , Coxeter notation , [ 1 ] orbifold notation , [ 2 ] and order.

6. Symmetry in mathematics - Wikipedia

   en.wikipedia.org/wiki/Symmetry_in_mathematics

   Symmetry occurs not only in geometry, but also in other branches of mathematics. Symmetry is a type of invariance: the property that a mathematical object remains unchanged under a set of operations or transformations. [1] Given a structured object X of any sort, a symmetry is a mapping of the object

7. Icosahedral symmetry - Wikipedia

   en.wikipedia.org/wiki/Icosahedral_symmetry

   Icosahedral symmetry is equivalently the projective special linear group PSL(2,5), and is the symmetry group of the modular curve X(5), and more generally PSL(2,p) is the symmetry group of the modular curve X(p). The modular curve X(5) is geometrically a dodecahedron with a cusp at the center of each polygonal face, which demonstrates the ...