Sound was vibration that was audible to the ear.

Some lifeforms were highly sensitive to loud noise. These included the Sensorites, (TV: The Sensorites, PROSE: The Monsters from Earth) the Voord, (PROSE: The Fishmen of Kandalinga) the Ethereals in their cloud form (PROSE: The Cloud Exiles) and the Verdants. (COMIC: Mission for Duh)

A sonic screwdriver could project sound to lock or unlock doors. (TVThe Mutants, Aliens of London)

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