Tn may refer to any of the following:
1. Short for twisted nematic, TN was developed by Schadt and Helfrich in 1971 and is a method of contorting the crystals in an LCD, forcing them to align in a single direction. This process prevents light from scattering, thus allowing LCDs to have a better contrast and making them practical.
2. When referring to a domain name, .tn is the domain name for Tunisia.