Sector (SEIV)
From SEWiki
Sectors in Space Empires IV are the units into which systems are divided, each system consisting of a 13x13 square grid of square sectors. Sectors in SEIV can contain a variety of stellar objects including stars, planets, storms, and nebulae, or nothing at all, and in addition could contain any number of ships and a limited number of units belonging to a single empire plus cloaked ships and units belonging to other empires.
See also:
