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  2. Symmetry in biology - Wikipedia

    en.wikipedia.org/wiki/Symmetry_in_biology

    Symmetry breaking occurs at several different levels in order to generate the anatomical asymmetry which we observe. These levels include asymmetric gene expression, protein expression, and activity of cells. For example, left–right asymmetry in mammals has been investigated extensively in the embryos of mice. Such studies have led to support ...

  3. Polyhedral group - Wikipedia

    en.wikipedia.org/wiki/Polyhedral_group

    The tetrahedral group of order 12, rotational symmetry group of the regular tetrahedron. It is isomorphic to A 4. The conjugacy classes of T are: identity; 4 × rotation by 120°, order 3, cw; 4 × rotation by 120°, order 3, ccw; 3 × rotation by 180°, order 2; The octahedral group of order 24, rotational symmetry group of the cube and the ...

  4. Rotational symmetry - Wikipedia

    en.wikipedia.org/wiki/Rotational_symmetry

    Rotational symmetry, also known as radial symmetry in geometry, is the property a shape has when it looks the same after some rotation by a partial turn. An object's degree of rotational symmetry is the number of distinct orientations in which it looks exactly the same for each rotation.

  5. Cyclic symmetry in three dimensions - Wikipedia

    en.wikipedia.org/wiki/Cyclic_symmetry_in_three...

    It has reflection symmetry with respect to a plane perpendicular to the n-fold rotation axis. C nv, [n], (*nn) of order 2n - pyramidal symmetry or full acro-n-gonal group (abstract group Dih n); in biology C 2v is called biradial symmetry. For n=1 we have again C s (1*). It has vertical mirror planes. This is the symmetry group for a regular n ...

  6. List of spherical symmetry groups - Wikipedia

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

    This article lists the groups by Schoenflies notation, Coxeter notation, [1] orbifold notation, [2] and order. John Conway uses a variation of the Schoenflies notation, based on the groups' quaternion algebraic structure, labeled by one or two upper case letters, and whole number subscripts.

  7. Icosahedral symmetry - Wikipedia

    en.wikipedia.org/wiki/Icosahedral_symmetry

    Every polyhedron with icosahedral symmetry has 60 rotational (or orientation-preserving) symmetries and 60 orientation-reversing symmetries (that combine a rotation and a reflection), for a total symmetry order of 120. The full symmetry group is the Coxeter group of type H 3. It may be represented by Coxeter notation [5,3] and Coxeter diagram.

  8. Category:Rotational symmetry - Wikipedia

    en.wikipedia.org/wiki/Category:Rotational_symmetry

    Print/export Download as PDF; Printable version; ... Pages in category "Rotational symmetry" The following 58 pages are in this category, out of 58 total.

  9. Polyomino - Wikipedia

    en.wikipedia.org/wiki/Polyomino

    symmetry with respect to both diagonal directions, and hence also 2-fold rotational symmetry: D 2 (7) 4-fold rotational symmetry: C 4 (8) 1 fixed polyomino for each free polyomino: all symmetry of the square: D 4 (1). In the same way, the number of one-sided polyominoes depends on polyomino symmetry as follows: 2 one-sided polyominoes for each ...

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