Tardis
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Tardis
Sign language

Aboard the Ark, Monoids communicated with human Guardians by a form of signing. (TV: The Ark)

The Seventh Doctor knew sign language. (PROSE: Sleepy)

A Viyran was performing sign language to the real Charley, but she couldn't understand it, so it copied her voice to communicate. (AUDIO: Patient Zero)

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