Unnamed NX class starships

This is a list of unnamed Earth starships of the.

Mirror universe
In the mirror universe, in late January 2155, two unnamed NX-class battleships were part of Admiral William Gardner's fleet dispatched to stop $𝜇$ from becoming the empress of the Terran Empire. Sato's vessel, the powerful a Federation starship from the future named USS Defiant (NCC-1764), easily reduced these two battleships two dust. 

The Romulan War
At some point before 2156, three unidentified NX-class starships were led by Enterprise into battle against a Romulan fleet during the Earth-Romulan War. 
 * On the novel's cover, all of these ships bear the registry NX-01.

Later service
By 2383, fifteen or sixteen NX-class starships were known to have been built. 
 * Not all of these sixteen ships have been identified by various media.