External inertial dampener
In the alternate reality, the external inertial dampener was  the technological equivalent to a parking brake, found aboard  starships. When engaged, such technology prevented a starship from jumping to warp.

In 2258, prior to his first jump to warp as helmsman aboard the , a nervous  failed to disengage the external inertial dampeners until  advised him. ()

See also 
 Inertial damping system

Propulsion technology