rhizoverbBeta
DictionarytauGreek letter
noun

tau

TAW/tɔː/

The nineteenth letter of the Greek alphabet.

Tau follows sigma in the Greek alphabet.

A close view of two ivory alphabet tiles displaying uppercase Τ and lowercase τ, with the distinctive lowercase form prominent.
Etymology
tauHebrewsign, mark; letter name

Hebrew taw means “sign, mark” and names the alphabet’s final letter. Tau preserves this ancient letter-name as the name of the Greek letter corresponding to English t.

In context

Khan Academy1:41
The symbol for torque is this fancy T. It's the Greek letter tau.
Torque | Physics | Khan Academy

More examples

  • She writes a capital tau on the board.
  • The symbol in the equation is the Greek letter tau.
  • He practices drawing lowercase taus in his notebook.

Forms

tau · taus