In Schoenflies notation, the symbol of a space group is represented by the symbol of corresponding point group with additional superscript. The superscript doesn't give any additional information about symmetry elements of the space group, but is instead related to the order in which Schoenflies derived the space groups. This is sometimes supplemented with a symbol of the form Γ Γ x y which specifies the Bravais lattice. Here x ∈ ∈ { t , m , o , q , r h , h , c } is the lattice system, and y ∈ ∈ { ∅ ∅ , b , v , f } is the centering type.