When a circle'sradius is 1 unit, its circumference is τ units. τ
( physics ) Torque .( physics ) Shear stress .( physics ) Optical depth .2006 Planetary and Space Science 54 , numbers9–10 ,→DOI 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 toτ ≲ 3 × 10 − 5 {\displaystyle \tau \lesssim 3\times 10^{-5}} ( mathematics , neologism ) irrational constant defined as theratio of thecircumference of acircle to itsradius , equal to theradian measure of afull turn π ).( particle physics ) tauon ( Teutonista ) [t̪] ( UPA ) voiced coronal click consonant (dental⟨ τ̦ ⟩ = IPA[ɡ͜ǀ] ;cacuminal ⟨ τ̣ ⟩ = IPA[ɡ͜ǃ] ).Derived from itsmajuscule counterpartΤ .
τ • (t ) (lowercase ,uppercase Τ
Lower-casetau (ταῦ Greek alphabet . It represented thevoiceless unaspirated alveolar or dental plosive /t/ . It is preceded byσ and followed byυ . See alsotau
( 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 ( W ) ϝ ( w ) ,Ͷ ͷ Ͱ ( H ) ͱ ( h ) ,Ϻ ( S ) ϻ ( s ) ,Ϟ ϟ Ϙ ( Q ) ϙ ( q ) ,Ͳ ( S ) ͳ ( s ) ( punctuation ) · ; ( diacritics ) ᾿ ῾ ◌́ ◌̀ ῀ ¨ τ • (t ) (lowercase ,uppercase Τ
Thelower case lettertau (ταυ ), the 19th letter of the modernGreek alphabet . ( 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 ( W ) ϝ ( w ) ,Ͷ ͷ Ͱ ( H ) ͱ ( h ) ,Ϻ ( S ) ϻ ( s ) ,Ϟ ϟ Ϙ ( Q ) ϙ ( q ) ,Ͳ ( S ) ͳ ( s ) ( punctuation ) · ; ( diacritics ) ᾿ ῾ ◌́ ◌̀ ῀ ¨ τ΄ ͵τ 
