Warp shadow
A warp shadow was a false sensor reading which could be emitted by a ship to fool an enemy vessel into firing upon nonexistent targets, thereby allowing a window of opportunity in which to avoid enemy fire.

In 2372, upon learning from Intendant  that Klingon-Cardassian Alliance vessels possessed targeting systems which could be fooled into targeting warp shadows,  and  piloted a Terran raider on a mission to distract the Alliance fleet, and projected warp shadows in order to evade torpedo fire. ()
Warp
Sensor technology