Energy whip
From Memory Alpha, the free Star Trek reference.
The energy whip is a handheld weapon used by the Ferengi. When lashed, it fires a pulse of energy that stuns the target.
Ferengi marauder Ulis, who attempted to raid the Earth starship Enterprise in 2151, was armed with an energy whip. (ENT: "Acquisition")
The Ferengi landing party encountered by a USS Enterprise-D away team in the Delphi Ardu system in 2364 were also armed with energy whips. (TNG: "The Last Outpost")
Ferengi Marauder Mo action figures have a toy energy whip as an accessory. (DS9: "Ferengi Love Songs")
