TN
Tn or TN may refer to:
Businesses and organizations
- Air Tahiti Nui (IATA airline designation "TN"), a French Polynesian airline
- Texas and Northern Railway, an American railway (reporting mark "TN")
- Todo Noticias, an Argentine cable news network
- Trans Australia Airlines (IATA airline designation "TN"), a defunct Australian airline
- Transports en commun de Neuchâtel et environs, a public transport operator in Neuchâtel, Switzerland
Places
- Tamil Nadu, a state in southern India (ISO abbreviation "IN-TN")
- Tennessee, US (postal abbreviation "TN")
- North Tipperary, Ireland (former code "TN")
- Tonbridge, a region in England (postcode "TN")
- Tunisia (ISO 3166-1 country code "TN")
- Trentino, a province in Italy (ISO abbreviation "IT-TN")
Science and technology
- .tn, the country code top level domain (ccTLD) for Tunisia
- TN network, a type of earthing system for protection in electricity network
- Neel Temperature, the temperature at which an antiferromagnetic material becomes paramagnetic (represented as TN)
- Tetraodon, a genus of pufferfish
- 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 uses
- TN status ('Treaty national', or 'Trade NAFTA'), an immigration status of a Canadian or Mexican citizen working in the USA under the NAFTA agreement
- Telephone number, in the telecommunications industry
- Tom Next (or Tomorrow Next), a financial trade which starts tomorrow and settles in the next trading day
- Trillion ('TN' or 'tn'), a number equal to 1012
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