That is also what I was wondering, that if I have higher values in a Matrix A than in a Matrix B but the "symmetry" is the same, then A will have a higher degree of asymmetry even it should be the same value, right? So dividing maybe the range by the largest value of the matrix?

thanks @CarloBeenakker! But that would be about rotational symmetry, no? What about pointsymmetry? My application if this is that I want to measure how symmetric a concrete Web Layout is, based on the grid distribution of the elements.