Multiple realities(covers information from several alternate timelines)
The Emmette-type was a type of starship operated on Earth and by the Terran Empire before the NX-class of starships.
This type of starship used rocket-like nozzles on the aft end of the ship. (Star Trek: Enterprise, opening credits)
In the mirror universe, ships of this type were equipped with photonic torpedoes. (ENT: "In a Mirror, Darkly", "In a Mirror, Darkly, Part II", opening credits)
Ships of this type Edit
Seen only in the opening credits, this model would inspire the "Warp Delta" starships seen in both the prime and mirror universes.