Translingual
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When a circle's radius is 1 unit, its circumference is τ units.
τ
( physics ) Torque .
( physics ) Shear stress .
( 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
τ
≲
3
×
10
−
5
{\displaystyle \tau \lesssim 3\times 10^{-5}}
.
( 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 ).
( physics ) tauon
( Teutonista ) a voiceless dental plosive (IPA [t̪] ).
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Ancient Greek
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Etymology
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Derived from its majuscule counterpart Τ .
τ • (t ) (lowercase , uppercase Τ )
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
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See also tau
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( Greek-script letters) Α α , Β β , Γ γ , Δ δ , Ε ε , Ζ ζ , Η η , Θ θ , Ι ι , Κ κ , Λ λ , Μ μ , Ν ν , Ξ ξ , Ο ο , Π π , Ρ ρ , Σ σ ς , Τ τ , Υ υ , Φ φ , Χ χ , Ψ ψ , Ω ω
( non-Classical letters ) Ϝ ϝ , Ͷ ͷ , Ͱ ͱ , Ϻ ϻ , Ϙ ϙ , Ͳ ͳ
( punctuation ) · ;
( diacritics ) ᾿ ῾ ◌́ ◌̀ ῀ ¨
τ • (t ) (lowercase , uppercase Τ )
The lower case letter tau (ταυ ), the 19th letter of the modern Greek alphabet .
See also
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( Greek-script letters) Α α , Β β , Γ γ , Δ δ , Ε ε , Ζ ζ , Η η , Θ θ , Ι ι , Κ κ , Λ λ , Μ μ , Ν ν , Ξ ξ , Ο ο , Π π , Ρ ρ , Σ σ ς , Τ τ , Υ υ , Φ φ , Χ χ , Ψ ψ , Ω ω
( non-Classical letters ) Ϝ ϝ , Ͷ ͷ , Ͱ ͱ , Ϻ ϻ , Ϙ ϙ , Ͳ ͳ
( punctuation ) · ;
( diacritics ) ᾿ ῾ ◌́ ◌̀ ῀ ¨
τ΄
͵τ