C2nv
C2nv is a designation that appears in discussions of molecular symmetry and group theory, belonging to the broader Cnv family. In this family, a molecule or object has a principal rotation axis of order n (Cn) and n vertical mirror planes that contain that axis. The value of n therefore encodes both the rotational symmetry and the number of vertical reflection planes. In standard references, the family is denoted Cnv, with specific members such as C2v, C3v, C4v, and so on.
In a symmetry-theoretic sense, Cnv groups are isomorphic to the dihedral group Dn. They consist of n
The notation C2nv is not widely used in standard literature. When encountered, it is typically a nonstandard
See also: Cnv, Dihedral group, Point group, Molecular symmetry.