Theta

From Biocrawler, the free encyclopedia.

Greek alphabet
Α α Alpha	Β β Beta
Γ γ Gamma	Δ δ Delta
Ε ε Epsilon	Ζ ζ Zeta
Η η Eta	Θ θ Theta
Ι ι Iota	Κ κ Kappa
Λ λ Lambda	Μ μ Mu
Ν ν Nu	Ξ ξ Xi
Ο ο Omicron	Π π Pi
Ρ ρ Rho	Σ σ Sigma
Τ τ Tau	Υ υ Upsilon
Φ φ Phi	Χ χ Chi
Ψ ψ Psi	Ω ω Omega
obsolete letters
Ϝ ϝ Digamma	Ϻ ϻ San
Ϙ ϙ Qoppa	Ϡ ϡ Sampi

• Note: A theta probe is a device for measuring soil moisture

Theta (upper case Θ, lower case θ) is the eighth letter of the Greek alphabet. In the system of Greek numerals it has a value of 9.

The lower-case letter θ is used as a symbol for:

• A plane angle in geometry.
• θ is the voiceless (inter)dental fricative in the International Phonetic Alphabet.

The upper-case letter Θ is used as a symbol for:

• Earth Day
• Death
• Dimensionless Temperature in transport phenomena

The letter Θ is an abbreviation for the Greek word thanatos (θάνατος: "death"; see Thanatos and Thanatology) and as it vaguely resembles a human skull, was occasionally used by Greeks as a warning symbol for death, in much the same way that skull and crossbones are used today.

The Cyrillic letter Fita arose from Theta.

Θ is used in Analysis of algorithms to denote an asymptotically tight bound.

ca:Thetael:θήτα es:Theta fr:Θ ja:Θ nl:Thèta pl:Theta fi:Theeta ru:фита sv:Theta zh:Θ

Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Theta_(letter) (http://en.wikipedia.org/wiki/Theta_(letter)) version history (http://en.wikipedia.org/w/index.php?title=Theta_(letter)&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License) CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)

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