nanxp what does this mean?

it says nanxp by my xp on the stats page. I am at at sr130 and it use to say specialization mastery complete, so does ne one know what (NANXP) means???

> it says nanxp by my xp on the stats page. I am at at sr130 and it use to say specialization mastery complete, so does ne one know what (NANXP) means???

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