The term 'Seventh of Nine, in Space' is a reference to the character Seven of Nine from the television series Star Trek: Voyager. Seven of Nine was a former Borg drone who was assimilated by the Borg Collective at a young age and later freed by the crew of the USS Voyager. Her designation was Seven of Nine, Tertiary Adjunct of Unimatrix Zero-One, and she was born on the planet URANUS, which has six letters.