Non Standard Settings of layer groups

LG - ordinal, SI - Standard setting (international symbol), IDS - Irreducible domain (standard), NI Non Standard Setting (international symbol),
IDN - Irreducible domain (Nonstandard setting if differs from IDS), TNC - Transformation to nonconventional setting (Koster-Seitz notation, a,b lattice periods), CO - Position of coordinate origin: n, (n) - on n^th order rotation axis; 2₁∩2₁ - intersection of two orthogonal screw axes; 2₁∩b - intersection of orthogonal screw axis and vertical glide plane; a∩b - on intersection of two orthogonal vertical glide planes.