9 (number)

9, or IX in Roman numerals, was a number. (AUDIO: The Odds Against)

The Ninth Doctor considered it to be his lucky number. (AUDIO: The Other Side)

The Lamadines had nine opposable digits. (TV: Terror of the Autons)

According to Jo Grant, 108 divided by 9 was 12. (TV: The Claws of Axos) Human pregnancies typically lasted nine months. (TV: The Gathering, Dark Water, The Tsuranga Conundrum)

The aspect ratio used by Giles when he talked to a camera about PROBE and leads in a case regarding an upcoming perihelion was 1920 x 1080, or 16:9. (WC: Out of the Shadows)

In the language spoken by the people who accidentally flew a spaceship to the Edge of the universe, the word for 9 was "Coliss". (TV: )