Transverse isotropy is sometimes called transverse anisotropy or anisotropy with hexagonal symmetry. The two testable structural consequences of the cosmological principle are homogeneity and isotropy. Materials can have varying extents of linearity, homogeneity and isotropy. Transversely isotropic materials have a plane of isotropy in which the elastic properties are isotropic. In geophysics, vertically transverse isotropy (VTI) is also known as radial anisotropy. However, homogeneity of materials does not necessarily mean isotropy. Thus, the Lorentz group is an isotropy subgroup of the isometry group of Minkowski spacetime. The notion of isotropy, for properties independent of direction, is not a consequence of homogeneity. Maps with nontrivial automorphisms correspond to points with isotropy in the orbifold. Under normal conditions, the diffraction pattern has circular symmetry, expressing the isotropy of the liquid. To summarize, "M" is a symmetric space "G"/"K" with a compact isotropy group "K". Amorphous particles typically adopt a spherical shape (due to their microstructural isotropy). This is a particular case due to the "isotropy" of the dielectric. A value of formula 104 corresponds to perfect isotropy. Isotropy is guaranteed by the fourth postulate, that all right angles are equal.