Warp eddy

A warp eddy was a residual phenomenon in space that was created by the effects of warp drive.

DaiMon Greko's Ferengi ship once hit a warp eddy and suffered damage to its hull. 

When Deep Space 9 lost contact with the USS Yangtzee Kiang in 2369, another runabout searching for Benjamin Sisko and the others detected the warp eddy current from the ship, allowing the Deep Space 9 crew to determine the course of the Yangtzee Kiang.