Hand pulse
From Tardis Wiki, the free Doctor Who reference
A hand pulse was a small handheld weapon which emitted an electromagnetic pulse. The weapon was typically used to destroy or disable a form of Cyberman.
One such weapon was invented by Mrs Moore of the the Preachers, for use against the Cybermen of her universe. (TV: Age of Steel)
Another version was seen at some point in the future, for use against the Cybermen of the Doctor's universe. Developed during the Cyber-Wars, this weapon was used by soldiers stationed on Hedgewick's World of Wonders against the newly returned (and improved) Cybermen. The Eleventh Doctor himself used a modified hand pulse to remove the Cyber-Planner who had attempted to take over his mind. (TV: Nightmare in Silver)
