Tri-Galactic

The Tri-Galactic was a trio of galaxies, including Mutter's Spiral, in which the Second Great and Bountiful Human Empire was active around the 42nd century. It is unknown if the other galaxies included were Mutter's Spiral's nearest neighbors, such as Andromeda and Triangulum, or if they were Satellite Galaxies. (DW: Planet of the Ood)