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UCN may stand for:

  • Ultracold Neutrons
  • Universal Character Name, as in the ISO 8859 standard, Unicode, C99, or C++.
  • Universidad Católica del Norte, a university in Antofagasta, Chile
  • University College of the North, a university college in Manitoba, Canada
  • Central University of Nicaragua, a private and nonprofit institution, Nicaragua
  • Urocortin, a human gene
  • UCN, the IATA Airport Code for Buchanan Airport