Tau (capital tiny Τ , τ ), in Greek ταῦ , letter of the Greek alphabet is the nineteenth. In Greek numeration, tau is worth 300.

In Greek old as in Greek modern, tau decides /t/, as in French.

Via the Etruscan Alphabet, it gave the T Latin alphabet.

Use

Tiny the τ is used to represent:
  • In Mathematical,
    • the Coefficient of correlation in Statistical;
    • the Golden section 1,618… (although the letter Φ is more often used);
  • In Physical,
  • In Chemistry, the Rate of advance of a limited chemical reaction;
  • In Astronomy, a measurement of the Opacity of the atmosphere;
  • In Biology, it acts of a Protéine implied in the degeneration neuronal E at the time of the Maladie of Alzheimer;
  • a old Symbol sometimes represented like a cross. See the article St. Anthony's cross.
  • In Heraldic, for the Distinguished soldiers or Virgin S, the tau is used to indicate a unit of the Arme of the transmissions.

In Hebrew alphabet, the letter Tav is written in the form of a T reversed.

  • In mathematics, the Tau capital letter reversed is used to represent a perpendicular.

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