TN

Tn or TN may refer to:

Organizations

• Air Tahiti Nui, a French Polynesian airline with the IATA airline designation "TN"
• Texas and Northern Railway, an American railway with the reporting mark "TN"
• Todo Noticias, an Argentine cable news network

Places

• 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 code for North Tipperary, Ireland

Scientific terms

• Neel Temperature, the temperature at which an antiferromagnetic material becomes paramagnetic (represented as T_N)
• 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

Other

• 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 (disambiguation)" ('TN' or 'tn')
• Telescope Nut, a nickname for an amateur telescope maker
• Telephone Number, an abbreviation used in the telecommunications industry