D-Six
this was the designation of one of the Dreadnaughts that was part of the Outbound Flight starship. D-Six was one of the five Dreadnaughts which was buried when the ship crashed into a large planetoid in the Redoubt, after it was attacked by a group of Chiss led by Thrawn. It was in D-Six that the Outbound Flight Colony established the Quarantine for potential Force-sensitive individuals. If a strong connection to the Force was discovered, an individual was exiled to D-Three.