Quadrant

Quadrant‏‎

Galaxy → Sector → QUADRANT → Region → Section → Division → District → Neighborhood

Defined area of space of 6,250 x 6,250 x 6,250 Light Years

There are 16 Quadrants per Sector  and 64 in the M-0 Galaxy )

Each Quadrant has an Science Corps Astrographic Institute designation SCAI (for example US-Q-01 -Upward Sector Quadrant 01) Very few quadrants have  "names" as there are usually more than one civilization in quadrant. But there is the Pluribus Quadrant (US-Q-05) Each Quadrant with Union space has an Army Quadrant HQ. Each Quadrant with border space to another society has a Border Guard - Quadrant HQ.
 * Space Train tickets are calculated by "Quadrants crossed".
 * Union Post Office also calculates postage that way.
 * Each Union space quadrant has a GalNet Center.
 * Military: Regions are under the Command of a Field Marshal (Army / Marines). The Navy does not use Quadrants as command structure designations.

There are 8 regions to a Quadrant.