The designations of the two components as Eta Draconis A and B derives from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).
The two components of Eta Draconis—A and B—are designated according to the convention set forth in the Washington Multiplicity Catalog (WMC), a system that has been adopted by the International Astronomical Union (IAU) for multiple star systems.