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From Warhammer 40k - Lexicanum
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[[File:Tauspace400.jpg|300px|thumb|right|The Tau empire, centred upon the world of [[T'au]].]]
A '''Sept''', also known as a '''realm''', is a star system colonised by the [[Tau T'au Empire]]; this includes all colonised planets, moons, and holdings such as orbital stations, and void structures within the system.{{Fn|10a}}{{Fn|10b}} Each Sept is named after its Sept World, also known as Prime Planet or Capital Planet, from which the Sept is governed and is denoted by a different [[Sept Symbol]] and colour for each, often related to the unique culture of each Sept.{{Fn|10b}}{{Fn|11}}
===Homeworlds===
