Impact alert
You may also be looking for the informal verbal alert "brace for impact" commonly used in the 24th century.An impact alert was an alert to notify crewmembers of a starship when their vessel was about to collide with another spatial object, like another vessel.

In 2233, the viewscreen of the  notified Captain George Kirk of an impact alert with the Narada after Kirk had set the Kelvin'' on a collision course with the enemy vessel. Twenty-five years later, an impact alert was declared on the bridge of the  when it warped right into a debris field of its fleet. While en route to Titan, an impact alert was declared right before the ship dropped out of warp. ()
Alerts