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  2. 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.

  3. 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.

  4. 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 ...

  5. Pentomino - Wikipedia

    en.wikipedia.org/wiki/Pentomino

    Their symmetry group has two elements, the identity and a diagonal reflection. Z can be oriented in 4 ways: 2 by rotation, and 2 more for the mirror image. It has point symmetry, also known as rotational symmetry of order 2. Its symmetry group has two elements, the identity and the 180° rotation. I can be oriented in 2 ways by rotation.

  6. 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).

  7. Square - Wikipedia

    en.wikipedia.org/wiki/Square

    r8 is full symmetry of the square, and a1 is no symmetry. d4 is the symmetry of a rectangle, and p4 is the symmetry of a rhombus. These two forms are duals of each other, and have half the symmetry order of the square. d2 is the symmetry of an isosceles trapezoid, and p2 is the symmetry of a kite. g2 defines the geometry of a parallelogram.

  8. Symmetry group - Wikipedia

    en.wikipedia.org/wiki/Symmetry_group

    The twelve rotations form the rotation (symmetry) group of the figure. In group theory , the symmetry group of a geometric object is the group of all transformations under which the object is invariant , endowed with the group operation of composition .

  9. Penrose tiling - Wikipedia

    en.wikipedia.org/wiki/Penrose_tiling

    Here, a tiling is a covering of the plane by non-overlapping polygons or other shapes, and a tiling is aperiodic if it does not contain arbitrarily large periodic regions or patches. However, despite their lack of translational symmetry, Penrose tilings may have both reflection symmetry and fivefold rotational symmetry.

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