Chi (letter)

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[[Image:Greek_alphabet_{{{letter|alpha-omega}}}.png|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 Sigma Τ τ Tau Υ υ Upsilon Φ φ Phi Χ χ Chi Ψ ψ Psi Ω ω Omega obsolete letters Ϝ ϝ Digamma Image:Greek alphabet san.png San Ϙ ϙ Qoppa Ϡ ϡ Sampi

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 palatal 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.

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