A system is a group of planets within a Sector. Such as the system of Hapes within the Sector Hapes Cluster. There are 1 or more system's in every sector of the galaxy. Usually when you conduct a Hyperspace jump you must enter the co-ordiantes of a specific system within a sector into your navcomputer.
Sector: Unknwon Regions
Sector: Outer Rim F-4
Known Systems - Mall'ordian, Maryo, Matra, Orron, Pypin, Rampa, Reltooine, Saffalore, Trian, Ylix, Oslumpex, Syloth, Bonadan, Etti, Kumasi, Mytus, Dostra, Drog, Lucaya, Bretta, hiib, Duroon, Ekibo, Erysthes, Fibuli, Gaurick, Goelitz, Ixtlar, Kail, Kalla, Kir, Knolstee, Lur
Sector: The Periphery