Chi (letter)

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[[Image:Greek alphabet {{{letter|alpha-omega}}}.png| 200px|center]]
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 ς Sigma
Τ τ Tau	Υ υ Upsilon
Φ φ Phi	Χ χ Chi
Ψ ψ Psi	Ω ω Omega
obsolete letters
Image:Greek alphabet digamma2.png Digamma	Image:Greek alphabet san.png San
Image:Greek alphabet qoppa.png Qoppa	Image:Greek alphabet sampi.png Sampi
Image:Greek alphabet stigma.png Stigma	Image:Greek alphabet sho.png Sho

For other uses, see Chi.

Chi (upper case Χ, lower case χ) is the 22nd letter of the Greek alphabet. In the system of Greek numerals it has a value of 600. The 'ch' in 'chi' is a voiceless velar fricative. In front of "light" vowels (e, i, oi, ai, y) it is prounounced like the 'ch' in German 'ich' or some variants of 'h' in the English 'hew' or 'human'. In front of "dark" vowels (a, o, ou) and of consonants, it is pronounced like the 'ch' in German 'ach' or in Scottish 'loch'.

The upper-case letter Χ is used as the symbol for:

• The name of Jesus Christ in Christianity, as in X-mas etc.

The lower-case letter χ is used as the symbol for:

• The chi-square distribution or Chi-square test in statistics.
• The electric susceptibility (sometimes with a subscript e) and magnetic susceptibility in physics.
• The chromatic number and the chromatic index (when shown with a prime mark or a subscript 1) of a graph in graph theory.
• The Euler characteristic in algebraic topology.
• The voiceless uvular fricative (IPA) in phonology.
• An unsigned gathering in formal bibliographic collation.
• The mole fraction of a solution in chemistry.
• The characteristic function of a subset in mathematics

Chi is the basis for the name Chiastic structure and the name of Chiasmus.als:Χ bg:Хи ca:Khi de:Chi el:Χι es:Χ fr:Chi ko:Χ it:Chi (lettera) he:כי nl:Chi (letter) nds:Chi ja:Χ pl:Chi (litera) pt:Χ sv:Chi zh:Χ