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See the homepage: http://www.symmetrymagazine.org/cms/ symmetry is a magazine about particle physics and its connections to other aspects of life and science, from interdisciplinary collaborations to policy to culture. It is published 6 times per year by Fermi National Accelerator Laboratory and SLAC National Accelerator Laboratory, both national laboratories funded by the Office of Science of the US Department of Energy.

Affine, definition from Wolfram MathWorld "The adjective "affine" indicates everything that is related to the geometry of affine spaces. A coordinate system for the n-dimensional affine space R^n is determined by any basis of n vectors, which are not necessarily orthonormal. Therefore, the resulting axes are not necessarily mutually perpendicular nor have the same unit measure. In this sense, affine is a generalization of Cartesian or Euclidean. "