The following documentation is transcluded from Template:NX/doc:

UsageEdit

To format links to the NX-class ships by either name or number. Links to the mirror universe NX-class ships should use the {{ISS}} template.

Using the ship name will result in just the name displaying:

{{NX|Enterprise}}

Enterprise

Using the number will result in the name and number displaying:

{{NX|02}}

Columbia NX-02

The opposite is true with ships with no canon name:

{{NX|Challenger}}

Challenger NX-03

{{NX|04}}

NX-04