Taser

A Taser is an electroshock weapon that uses electrical current to disrupt voluntary control of muscles. The Taser fires two small dart-like electrodes, which stay connected to the main unit by conductive wire as they are propelled by small compressed nitrogen charges similar to some air gun or paintball marker propellants.

Drive Stun
Some Taser models, particularly those used by police departments, also have a "Drive Stun" capability, where the Taser is held against the target without firing the projectiles, and is intended to cause pain without incapacitating the target.

In Mortal Kombat
In the franchise, Stryker uses them as special moves and Fatalities.