Nightstick
The Nightstick is a non-lethal weapon used by police forces in Earthrealm.
Officer Kurtis Stryker uses one, befitting his position as a New York cop in Mortal Kombat 3 (and its updates).
Though, the nightstick is only used as a single baton, Stryker uses a pair of Nightstick in Mortal Kombat: Armageddon.
Gallery
Stryker with his Nightstick
Stryker's Nightsticks used as tonfas in MK: Armageddon