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: )
In the language spoken by the crew of the captain's spaceship that accidentally flew to the edge of the universe, the word for 9 was "Coliss". The Fourteenth Doctor, while not speaking the language was able to translate this number, and used that to read the ship's base code, data logs and control elements of the ship. (TV: )
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