12 (number)

12 was a number.

According to Jo Grant, 108 divided by 9 was 12. Also according to her, 12 divided by 4 was 3. (TV: The Claws of Axos)

When the Twelfth Doctor asked Clara Oswald to pick a two-digit number, she chose 12. He then asked the crew of the crew to look at the first word of page 12 of the book they were holding, as part of the Helman-Ziegler test. (TV: Last Christmas)