A whip-like Ferengi weapon that discharges a bolt of energy when cracked, carried by the Ferengi landing party in their first on-screen meeting with Starfleet.
The energy whip is a flexible hand weapon; when the user snaps it towards a target it throws a pulse of energy capable of stunning a humanoid.
It is introduced in the Next Generation episode The Last Outpost, the first appearance of the Ferengi. On the surface of Gamma Tauri IV, a group of Ferengi led by Letek ambush Riker's away team and use the whips to knock them down before both sides are confronted by the guardian of the ancient Tkon Empire.
The weapon was soon dropped as the portrayal of the Ferengi changed, but it returns in the Enterprise episode Acquisition, in which Ferengi pirates who board the NX-01 in the 22nd century are armed with similar whips.