Tau (letter)

Greek alphabet
Α α Alpha	Β β Beta
Γ γ Gamma	Δ δ Delta
Ε ε Epsilon	Ϝ ϝ Digamma
Ζ ζ Zeta	Η η Eta
Θ θ Theta	Ι ι Iota
Κ κ Kappa	Λ λ Lambda
Μ μ Mu	Ν ν Nu
Ξ ξ Xi	Ο ο Omicron
Π π Pi	Ϻ ϻ San
Ϙ ϙ Qoppa	Ρ ρ Rho
Σ σ Sigma	Τ τ Tau
Υ υ Upsilon	Φ φ Phi
Χ χ Chi	Ψ ψ Psi
Ω ω Omega	Ϡ ϡ Sampi

Tau (upper case Τ, lower case τ) is the 19th letter of the Greek alphabet. In the system of Greek numerals it has a value of 300.

The lower-case letter τ is used as a symbol for:

• Torque, the rotational force in mechanics.
• The elementary tauon particle in particle physics.
• The lifetime of a spontaneous emission process.

• Tau is the name of an island near Kilinailau, Greenwich Island, and Ocean Island.
• In Games Workshop's Warhammer 40,000 science fiction gaming universe, the Tau are an alien race.

Tau is the name of a small village near Stavanger in Rogaland,Norway. You travel through Tau to get to the famous Pulpit Rock