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  2. Nonomino - Wikipedia

    en.wikipedia.org/wiki/Nonomino

    Their symmetry group has two elements, the identity and the reflection in a line parallel to the sides of the squares. 26 nonominoes have an axis of reflection symmetry at 45° to the gridlines. Their symmetry group has two elements, the identity and a diagonal reflection. 19 nonominoes have point symmetry, also known as rotational symmetry of ...

  3. Reinhardt polygon - Wikipedia

    en.wikipedia.org/wiki/Reinhardt_polygon

    The Reinhardt polygons that have this sort of rotational symmetry are called periodic, and Reinhardt polygons without rotational symmetry are called sporadic. If n {\displaystyle n} is a semiprime , or the product of a power of two with an odd prime power , then all n {\displaystyle n} -sided Reinhardt polygons are periodic.

  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. Point groups in three dimensions - Wikipedia

    en.wikipedia.org/wiki/Point_groups_in_three...

    The infinite series of axial or prismatic groups have an index n, which can be any integer; in each series, the nth symmetry group contains n-fold rotational symmetry about an axis, i.e., symmetry with respect to a rotation by an angle 360°/n. n=1 covers the cases of no rotational symmetry at all

  6. Octomino - Wikipedia

    en.wikipedia.org/wiki/Octomino

    Their symmetry group has two elements, the identity and the 180° rotation. 1 octomino (coloured yellow) has rotational symmetry of order 4. Its symmetry group has four elements, the identity and the 90°, 180° and 270° rotations. 4 octominoes (coloured purple) have two axes of reflection symmetry, both aligned with the gridlines.

  7. Symmetry (geometry) - Wikipedia

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

    The triskelion has 3-fold rotational symmetry. Rotational symmetry is symmetry with respect to some or all rotations in m-dimensional Euclidean space. Rotations are direct isometries, which are isometries that preserve orientation. [17] Therefore, a symmetry group of rotational symmetry is a subgroup of the special Euclidean group E + (m).

  8. Lists of shapes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_shapes

    Lists of shapes cover different types of geometric shape and related topics. They include mathematics topics and other lists of shapes, such as shapes used by drawing or teaching tools. They include mathematics topics and other lists of shapes, such as shapes used by drawing or teaching tools.

  9. List of mathematical shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_shapes

    Compound of four octahedra with rotational freedom; Compound of four tetrahedra; Compound of four triangular prisms; Compound of great icosahedron and great stellated dodecahedron; Compound of six cubes with rotational freedom; Compound of six decagonal prisms; Compound of six decagrammic prisms; Compound of six pentagonal prisms

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