4 (number)
From Tardis Wiki, the free Doctor Who reference
4 was a number.
According to Jo Grant, three sevens times four were equal to 84. Also according to her, 12 divided by 4 was 3. (TV: The Claws of Axos)
Some species, like the Empathivores, (COMIC: The Whispering Gallery) the Moxolon Swamp Vipers, (TV: The Vault of Secrets) the Tractites (PROSE: Genocide) and the Tetraps (TV: Time and the Rani) had four eyes.
