Sector 6 was a star sector.
Three major battles of the Intergalactic War occurred in this sector, along with many smaller engagements.
The star orbited by Terminal was in Sector 6.
It was also the location of the planet Obsidian - Obsidian had a position of key strategic importance but remained neutral.
Domo may have been in this area - it was described as being on the edge of the Sixth Quadrant.