“Classic” Sudoku has the interesting quality of being an 3×3 matrix of 3×3 matrices. In [M] game theory, this is referred to as the supersymmetrical configuration: mn(mn)
By contrast, an mn(jn) configuration is referred to as semisymmetical.
Jigsaw Sudoku configurations can be somewhatsymmetrical, sortofsymmetrical, slightlysymmetrical and asymmetrical. The latter two terms in this context refer to configurations where number of cells in a given region varies by region. Megacells in asymmetrical configurations are not restricted to rectangles, and may be irregular.