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"NX" stood for "Naval eXperimental", and could refer to any vessel that contained entirely new technologies and/or design concepts – such as the four-nacelle USS Constellation – or merely the first starship of a particular class – such as the new-design USS Excelsior – before it was approved for class production.
It was not applied to all ships that were the first member of their class, especially if it is known that the class would be put into serial production immediately.