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
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