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Tn or TN may refer to:



  • Tamil Nadu, a state in southern India, whose ISO abbreviation is "IN-TN"
  • Tennessee, a state in the United States, whose postal abbreviation is "TN"
  • Tonbridge, a region in England with the postcode "TN"
  • Tunisia, ISO 3166-1 country code
    • .tn, the country code top level domain (ccTLD) for Tunisia
  • Province of Trento, a province in Italy, whose ISO abbreviation is "IT-TN"
  • the former code for North Tipperary, Ireland

Scientific terms[edit]

  • Neel Temperature, the temperature at which an antiferromagnetic material becomes paramagnetic (represented as TN)
  • Trigeminal neuralgia, a neuropathic disorder
  • Transposon (when immediately followed by a number), a DNA sequence that can change positions
  • Twisted nematic field effect, the technology that made LCD displays practical


  • TN network, a type of earthing system for protection in electricity network
  • TN status ('Treaty national', or 'Trade NAFTA'), an immigration status of a Canadian or Mexican citizen working in the USA under the NAFTA agreement
  • Tetraodon, a genus of pufferfish
  • The number "trillion" ('TN' or 'tn')
  • Telescope Nut, a nickname for an amateur telescope maker
  • Telephone Number, an abbreviation used in the telecommunications industry
  • Tom Next (or Tomorrow Next), a trade starts tomorrow and settles in the next trading day
  • Twisted nematic, a TFT LCD display type.