|Description:||Mapping unit in astrography equal to sixteen subsectors. Average density is 500 to 650 worlds per sector.|
Sectors are named, and several synonyms are in common use, including march (or marches), region, reach (or reaches), quadrant, and matrix. The Spinward Marches, for example, is a sector.
As a rough means of comparing size, the sector counts of the large interstellar states and areas of settlement are: the Imperium: 27; the Aslan Hierate: 18; the Hive Federation: 17; the Two Thousand Worlds: 14; the Vargr Extents: 14; the Zhodani Consulate: 13; the Solomani Confederation: 11.