Tau (Disambiguation)

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

Tau may also refer to:

• Tau (mathematical constant), a constant equal to 2π (6.28318...)

• 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)

• Tau Day