Ion drive
From Tardis Wiki, the free Doctor Who reference
An ion drive was a type of engine. They characteristically pulsed, allowing K9 to detect one when it was nearby. (TV: Underworld)
The spaceship Shadow had an ion drive system, including an "ion chamber". (TV: Enlightenment)
The spaceship K-NEL was powered by three ion rocket motors. (PROSE: K9 and the Time Trap)
The exodus ships that left Red Rocket Rising and were subsequently destroyed by the Daleks ran on ion drive engines. When these ships were blown up, "what you [got]" was ionotronic dust. (AUDIO: Blood of the Daleks)
