NX

NX is a starship registry number prefix in use by both the Earth and Federation Starfleets.

In the Earth Starfleet it was used to represent the NX class starships.

In the Federation Starfleet, they would come to be used by experimental starship designs that generally would become the first starship (or prototype) of their class.

Examples of NX ships

 * USS Excelsior, NX-2000
 * USS Defiant, NX-74205
 * USS Prometheus, NX-59650