Saint Thomas, Biblical character – a "disbelieving/doubting Thomas" (someone who lacks faith), São Tomé and Príncipe, Saint Thomas Tower. John T. Thompson, American inventor – Thompson submachine gun, aka the "Tommy gun". James Tobin, American economist – Tobin tax. J.R.R. Tolkien, South-African/British novelist – Tolkienology. Lorenzo de Tonti, Italian businessman – tontine. Howard Henry Tooth, British neurologist – Charcot–Marie–Tooth disease. Carlos Torre Repetto – Torre Attack. Evangelista Torricelli, Italian mathematician and inventor – torr (unit of pressure), Torricelli's Law, Torricelli's equation. Linus Torvalds, Finnish computer programmer – Linus's law, Linux operating system (from Linus' Minix), Tux – mascot of Linux (from Torvald's Unix). Charles Townshend, British politician – Townshend Acts. Arnold Toynbee, British economist – Toynbee Hall. Sakichi Toyoda, Japanese businessman – Toyota. Trajan, Roman emperor – Trajan's Column, Trajan's Wall. Friedrich Trautwein, German inventor - Trautonium. Trillian, British literary character – Trillian (software), Project Trillian. Octavio Trompowsky, Brazilian chess player – Trompowsky Attack. Leon Trotsky, Russian politician and writer – Trotskyism Harry S. Truman, American president – Truman doctrine Donald Trump, American businessman and politician – Trump Tower, the Trump International Hotel and Tower, Trump Plaza etc. Mikhail Tugan-Baranovsky, Russian economist – Tugan-Baranovskii theory of business cycles Túpac Amaru II, Peruvian resistance leader – Tupamaros. Alan Turing, British mathematician and inventor – Turing machine, Turing-complete, Turing tarpit, Turing test, Church–Turing thesis, Church–Turing–Deutsch principle. J. M. W. Turner, English painter – Turner Prize Ted Turner, American business man – Turner Entertainment, Turner Classic Movies, Turner Broadcasting System or TBS, TBS Superstation, WTBS, Turner Network Television or TNT, Turner Tomorrow Fellowship Award. Marie Tussaud, French sculptor – Madame Tussauds. Maurice Tweedie, physicist and statistician – Tweedie distribution. U Antonio de Ulloa, Spanish naval officer, scientist, and administrator - Ulloa's circle (also known as Bouguer's halo and the Fog bow) Uranus, Greek-Roman mythological character – uranium, Uranus Urhunden, Swedish comics character – Urhunden Prize Saint Ursula, Christian martyr – Ursulines V Saint Valentine, Roman martyr – Valentine's Day. Rudolph Valentino, Italian-American actor – Valentino's syndrome. Jean Parisot de Valette, French nobleman – Valletta. Antonio Maria Valsalva, Italian physician – Valsalva maneuver, Valsalva device. Vanadis, synonym for the Norse mythological character Freyja – vanadium. James Van Allen, American astronomer – Van Allen radiation belt. George Vancouver, British explorer – Vancouver, British Columbia, Vancouver, Washington, Vancouver Island. Constant Vanden Stock, Belgian association football player and manager – Constant Vanden Stock Stadium. Johannes Diderik van