Friction
From Tardis Wiki, the free Doctor Who reference
Friction was a physical process whereby energy could be transferred via the rubbing together of two objects. Friction could be used to ignite the white phosphorus on 19th century matches. (PROSE: The Death of Art)
The War Doctor and Eleventh Doctor's TARDISes both had friction contrafibulator buttons on their consoles. (TV: The Day of the Doctor, Vincent and the Doctor)
