Seven Systems
From Tardis Wiki, the free Doctor Who reference
The Seven Systems was an area of space in which Gallifrey and Levithia were located. (PROSE: The Twins in the Wood) Gallifrey was known as the "Shining World of the Seven Systems". (TV: The Sound of Drums) Black hole drives were banned in every corner of the Seven Systems. (COMIC: Pirates of Vourakis)
