An energy whip (also known as a plasma whip) is a Ferengi hand-held weapon, which shoots a pulse of energy when lashed.

Energy whips were used by Ferengi marauder Ulis during his raid on the Earth starship Enterprise in 2151 (ENT episode: "Acquisition"), and by the Ferengi landing party at the Delphi Ardu system in 2364. (TNG episode: "The Last Outpost")

Law enforcement officer on Ferenginar were normally armed with energy whips. (DS9 - Worlds of Star Trek: Deep Space Nine novel: Ferenginar: Satisfaction is Not Guaranteed)

Ferengi are taught to yield the whips at the Ogger College of Archery and Plasma Whippery. (DS9 short story: "The Last Tree on Ferenginar: A Ferengi Fable From the Future")

The Marauder Mo action figure included a toy energy whip as an accessory. (DS9 episode: "Ferengi Love Songs") When they were children, Rom lost the toy energy whip that belonged to Quark's Marauder Mo action figure. (DS9 reference: Legends of the Ferengi)