250 (number)
From Tardis Wiki, the free Doctor Who reference
250 was a number.
The Hashashin had 250 members. Their faces were painted on the walls of the Cave of Five Hundred Eyes. (TV: "Five Hundred Eyes")
On Volag-Noc, the Tenth Doctor was charged with, among other crimes, 250 counts of evading library fines. (TV: The Infinite Quest)
The Aztec temple visited by the First Doctor was 250 feet tall. (PROSE: The Aztecs)
The temple of Ishtar in Kish was 250 feet long and 50 feet wide. (PROSE: Timewyrm: Genesys)
Miríl was 250 years old when he met the Seventh Doctor. (PROSE: Timewyrm: Apocalypse)