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XN may refer to:

  • crossed Nicols, see Nicol prism
  • the two-letter code of the Nordic Patent Institute
  • the four-character prefix "xn--" used in the ASCII representation of Internationalized domain names
  • a shorthand abbreviation for Christian, based on the Greek letter Chi used by early Christians
  • a part of a notation indicating a nuclear reaction that is expected to produce one or more neutrons
  • the Canadian artist Christian Cardell Corbet, who uses XN as an abbreviation of his name
  • Xtranormal, the former animation software