The FLRW metric starts with the assumption of homogeneity and isotropy of space.
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Isotropy is guaranteed by the fourth postulate, that all right angles are equal.
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The two testable structural consequences of the cosmological principle are homogeneity and isotropy.
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At the nano scale however you have a break in this isotropy due to suppression induced by Casimir geometry.
From the froarty.scienceblog.com
The isotropy of the cosmic background radiation is another indicator that the universe does not rotate.
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Kinetic theory is also an example of isotropy.
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This preference has to do with its softness, relative isotropy and homogeneity, and a relative resistance to shattering.
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The hydrogen is free to re-accumulate velocity and oscillate between H1 and H2 powered by this break in isotropy.
From the froarty.scienceblog.com
Bruno's cosmology is marked by infinitude, homogeneity, and isotropy, with planetary systems distributed evenly throughout.
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More examples
(physics) the property of being isotropic; having the same value when measured in different directions
(isotropic) invariant with respect to direction
Isotropy is uniformity in all directions; it is derived from the Greek iso (equal) and tropos (direction). Precise definitions depend on the subject area. Exceptions, or inequalities, are frequently indicated by the prefix an, hence anisotropy. ...
(Isotropic (quadratic form)) In mathematics, a quadratic form over a field F is said to be isotropic if there is a non-zero vector on which it evaluates to zero. Otherwise the quadratic form is anisotropic. ...
The property of being identical, or having the same physical properties, in all directions
An isotropic Universe has no preferred direction. It behaves the same in every direction. For example, the redshift of distant galaxy clusters looks the same in the direction of Orion as it does in Scorpius.
(Isotropic (non-oriented)) The material has no preferred direction of magnetic orientation, which allows magnetization in any direction.
(isotropic) Having NO dependence on direction or angle.