10 (number)

10 was a number.

The Trojan War lasted for ten years. (TV: The Myth Makers)

According to Jo Grant, 98 plus 10 was equal to 108. (TV: The Claws of Axos)

When discussing his regeneration cycle, the Eleventh Doctor confirmed that he had used up all twelve regenerations, as his previous self, who he called "Number Ten", used two regenerations. (TV: The Time of the Doctor)