Tav or TAV may refer to: Math, science and technology Tav (number), in set theory the collection of all cardinal numbers The Advanced Visualizer, a 3D graphics software package Tomato aspermy virus, a plant virus Tropical Atlantic Variability, in meteorology Ti-6Al-4V, a titanium alloy containing aluminum and vanadium Treno Alta Velocità, a special-purpose entity for the construction of a high-speed rail network in Italy Codes TAV, IATA airport code for Tau Airport, American Samoa TAV, airline code for Compañía de Servicios Aéreos Tavisa tav, ISO 639-3 code for the Tatuyo language of Colombia Nickname Tav Falco (born 1945), American musical performer, performance artist, actor, filmmaker and photographer Octavio M. Salati (1914–2001), American engineer, academic and educator Other uses Tav (letter), the last letter of many Semitic abjads TAV Airports Holding (Tepe Akfen Ventures), a Turkish airport operator Treno Alta Velocità, the working name for the planning and construction of the Italian high-speed rail network The Artists Village, an experimental arts group in Singapore Toon-A-Vision channel See also TAV-8B, the two-seat version of the McDonnell Douglas AV-8B Harrier II aircraft TAV RJ-SP, the Brazilian Rio–São Paulo high-speed rail system