- It is an astrographic feature consisting of a number of linked clusters and traces forming part of the Spinward Main.
- It is located outside the borders of the Imperium, on the Spinward Main in District 268 and the Sword Worlds Subsector of Spinward Marches Sector.
The Arm provides the only Jump-1 link between the handful of Imperial worlds in Five Sisters Subsector and the rest of Imperial territory. The Arm diverges from the Main at Caliburn (Spinward Marches 1430) in the direction of Foreven Sector and meanders Spinward until Flammarion (Spinward Marches 0930) and the beginning of the chain known as Sisters' Reach.
The Arm is an underdeveloped backwater and sees much less traffic than the more central parts of the Main; consequently, a great deal is not commonly know about the systems. Given that these frontier worlds are not members of the Imperium, it is difficult at best and more often hazardous for Imperial traders to operate in the Arm.
Worlds & Sectors (Astrography)
World Listing: 1105