Star Trek Expanded Universe

The BRS Argus (NAR-124) was a DY-300-class British Republican sleeper ship, constructed in the mid 21st Century. (Star Trek: The Adventures of Argus)

In 2374 the USS Argus discovered the BRS Argus in the Ganoris system after responded to a Morse code distress signal that had been specifically targeted at Sara Parker. (Star Trek: The Adventures of Argus: "Messages From Home")

The Argus' BRS prefix stands for British Republican Spaceship.