Terminology

FTL Travel
The use of FTL has been achieved by punching a hole into a parallel dimension simply called "the Void" due to its emptiness. Positions within the dimension have rough equivalents to the "prime" universe and allow starships to cross shorter distances in a smaller amount of time.

In order to create a stable wormhole into the Void and out of, a ship must be equipped with a proper device that creates an opening at the starting point, but a disruption at the exit portal. Many ships have been outfitted with technology that can detect these disruptions, allowing them to identify that a starship is incoming when they arrive and the number or size of ships which affects the frequency and size of the disruption itself.

FTL Jammers
The stror has developed a unique countermeasure that reinforces the barrier between the prime universe and the parallel dimension, ensuring any starship that tries to re-enter the universe is forced to cleave through the barrier, damaging their ship and destroying their FTL drive.