More complicated looping diagrams can also be expressed with care. The paracompact Coxeter group can be represented by Coxeter notation [(3,3,(3),3,3)], with nested/overlapping parentheses showing two adjacent [(3,3,3)] loops, and is also represented more compactly as [3 ], representing the rhombic symmetry of the Coxeter diagram. The paracompact complete graph diagram or , is represented as [3 ] with the superscript [3,3] as the symmetry of its regular tetrahedron coxeter diagram.