ISS Excelsior (NCC-2000-D)

In the mirror universe, the ISS Excelsior (NCC-2000-D) was a Terran Empire cruiser in Imperial Starfleet service in the early 25th century. 

Background
The ISS Excelsior along with the ISS Exeter, ISS Dakota, ISS Galaxy, ISS Sovereign, ISS Liebig and the ISS Emissary is one of seven default vessels of the Terran Cruiser NPC ship type in Star Trek Online, replacing the ISS Cheyenne on June 2012.