Static power pulse
According to the Eleventh Doctor, a static power pulse was as "characteristic as an audio signature" to the Daleks. Amy Pond likened it to a giant heartbeat. (COMIC: The Only Good Dalek)
It's the sound that means death and destruction... the sound that means death and fear... the sound that means the Daleks are coming.
The distinctive sound was heard within most Dalek bases, including the Dalek City on Skaro, (TV: The Daleks, The Magician's Apprentice/The Witch's Familiar) the Cult of Skaro's Transgenic Laboratory (TV: Daleks in Manhattan/Evolution of the Daleks) and Dalek spaceships, (TV: Victory of the Daleks, Into the Dalek) including the Dalek Flagship. (TV: Bad Wolf/The Parting of the Ways)
Behind the scenes
The sound can be heard in a ship amongst the Dalek War Fleet in the "Next Time" trailer for The Vanquishers, but was unheard in the final cut of the episode itself.
