Tau (Disambiguation)

Tau (Τ or τ) is the 19th letter of the Greek alphabet.

Tau may also refer to:

Mathematics
 Tau (mathematical constant), a constant equal to  (6.28318...)

Science and technology
 TAU (spacecraft), a proposal to send a space probe to a thousand units from the Earth
 Tau (particle), also called Tau lepton, an elementary particle
 Tau emerald, a species of dragonfly
 Tau neutrino a particle
 Tau protein, a biochemical protein
 Tau, the standard astronomical abbreviation for Taurus (constellation)

Other
 Tau Day