The Bayer designation Omicron Cygni (ο Cyg / ο Cygni) is shared by two or three star systems in the constellation Cygnus. Application of the superscripts to the three stars varies in different publications; the Flamsteed designations are unambiguous: ο1 Cygni: 31 Cygni, sometimes 30 Cygni ο2 Cygni: 32 Cygni, sometimes 31 Cygni ο3 Cygni: sometimes 32 Cygni