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Chi (Greek letter)

Greek alphabet
Α α Alpha	Β β Beta
Γ γ Gamma	Δ δ Delta
Ε ε Epsilon	Ϝ ϝ Digamma
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	Ϻ ϻ San
Ϙ ϙ Qoppa	Ρ ρ Rho
Σ σ Sigma	Τ τ Tau
Υ υ Upsilon	Φ φ Phi
Χ χ Chi	Ψ ψ Psi
Ω ω Omega	Ϡ ϡ Sampi

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 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 in statistics.
• The electric susceptibility in physics.
• The chromatic number of a graph in graph theory.
• The voiceless uvular fricative (IPA) in phonology.