27 (number)
From Tardis Wiki, the free Doctor Who reference
27 was a number.
At one point during their failure, a Kroton calculated they would have to reserve power for 27 further minutes before it exhausted. (TV: The Krotons)
Vega 3 was 27 light-years from Earth. (PROSE: K9 and the Beasts of Vega)
Through use of a magnetron, the New Dalek Empire transported 27 stolen planets from across time and space to the Medusa Cascade, where they collectively served as an engine for the Daleks' reality bomb. (TV: The Stolen Earth/Journey's End)
Behind the scenes
In NOTVALID: The Curse of Fatal Death, the Ninth Doctor calculates that he has saved every planet in the known universe a minimum number of 27 times.
