XN

XN may refer to

* crossed Nicols, see Nicol prism
* the two-letter code of the Nordic Patent Institute World Intellectual Property Organization, [http://www.wipo.int/edocs/pctndocs/en/2007/pct_news_2007_12.pdf "Nordic Patent Institute to Start Functioning as International Searching and Preliminary Examining Authority"] , PCT Newsletter, 12/2007 ]
* xn-- as the prefix used to convert non-Roman characters for use in Internationalized domain names.
* Xn as a shorthand abbreviation for Christian, based on the Greek letter Chi (letter) used by early Christians.

References