Sector (SEII)
From SEWiki
Sectors in Space Empires II were the units into which systems were divided, each system consisting of a 9x9 square grid of square sectors. Sectors in SEII could contain as stellar objects either a star, a planet, a storm, or nothing, and in addition could contain any number of ships belonging to a single empire plus cloaked ships belonging to other empires.
See also:
