τ

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τ U+03C4, τ
GREEK SMALL LETTER TAU
σ
[U+03C3]
Greek and Coptic υ
[U+03C5]
𝜏 U+1D70F, 𝜏
MATHEMATICAL ITALIC SMALL TAU
𝜎
[U+1D70E]
Mathematical Alphanumeric Symbols 𝜐
[U+1D710]

Translingual[edit]

When a circle's radius is 1 unit, its circumference is τ units.

Symbol[edit]

τ

  1. (physics) Torque.
  2. (physics) Shear stress.
  3. (physics) Optical depth.
    • 2006 August, Alexander V. Krivov, Artem G. Feofilov, Valeri V. Dikarev, “Search for the putative dust belts of Mars: The late 2007 opportunity”, in Planetary and Space Science, volume 54, numbers 9–10, →DOI, page 871:
      The first one was made by the Viking Orbiter 1 spacecraft in 1980 (Duxbury and Ocampo, 1988) and brought a negative result, setting the upper limit of the normal optical depth of the putative tori to .
  4. (mathematics, neologism) An irrational constant defined as the ratio of the circumference of a circle to its radius, equal to the radian measure of a full turn; approximately 6.283185307 (equal to 2π, or twice the value of π).
  5. (physics) tauon
  6. (Teutonista) a voiceless dental plosive (IPA [t̪]).

See also[edit]

Ancient Greek[edit]

Etymology[edit]

Derived from its majuscule counterpart Τ.

Letter[edit]

τ (t) (lowercase, uppercase Τ)

  1. Lower-case tau (ταῦ), the 19th letter of the ancient Greek alphabet. It represented the voiceless unaspirated alveolar or dental plosive /t/. It is preceded by σ and followed by υ.

Derived terms[edit]

See also tau

See also[edit]

Greek[edit]

Letter[edit]

τ (t) (lowercase, uppercase Τ)

  1. The lower case letter tau (ταυ), the 19th letter of the modern Greek alphabet.

See also[edit]