# symmetry

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**symmetry plane**— Crystall. See reflection plane. [1875 80] …102

**symmetry breaking**— …103

**Rotational symmetry**— Generally speaking, an object with rotational symmetry is an object that looks the same after a certain amount of rotation. An object may have more than one rotational symmetry; for instance, if reflections or turning it over are not counted, the …104

**Spontaneous symmetry breaking**— Quantum field theory (Feynman diagram) …105

**Molecular symmetry**— in chemistry describes the symmetry present in molecules and the classification of molecules according to their symmetry. Molecular symmetry is a fundamental concept in chemistry, as it can predict or explain many of a molecule s chemical… …106

**One-dimensional symmetry group**— A one dimensional symmetry group is a mathematical group that describes symmetries in one dimension (1D). A pattern in 1D can be represented as a function f(x) for, say, the color at position x. The 1D isometries map x to x + a and to a − x.… …107

**Octahedral symmetry**— The cube is the most common shape with octahedral symmetry A regular octahedron has 24 rotational (or orientation preserving) symmetries, and a symmetry order of 48 including transformations that combine a reflection and a rotation. A cube has… …108

**Mirror symmetry (string theory)**— In physics and mathematics, mirror symmetry is a relation that can exist between two Calabi Yau manifolds. It happens, usually for two such six dimensional manifolds, that the shapes may look very different geometrically, but nevertheless they… …109

**Event symmetry**— The term Event symmetry describes invariance principles that have been used in some discrete approaches to quantum gravity where the diffeomorphism invariance of general relativity can be extended to a covariance under any permutation of… …110

**Reflection symmetry**— Reflection symmetry, line symmetry, mirror symmetry, mirror image symmetry, or bilateral symmetry is symmetry with respect to reflection.In 2D there is an axis of symmetry, in 3D a plane of symmetry. An object or figure which is indistinguishable …