From Wiktionary, the free dictionary
Either Greek- or Latin-style chi may be used in IPA.
χ
( IPA ) voiceless uvular fricative .( superscript ⟨ᵡ⟩ , IPA ) [χ] -fricated release of a plosive (e.g. [qᵡ] , sometimes implying an affricate [q͡χ] ); [χ] -coloring; or a weak, fleeting or epenthetic [χ] .( UPA ) voiceless velar fricative (IPA [x] ).( mathematics ) characteristic function characteristic polynomial Not to be confused with κ ( k ) (the cursive kappa). Derived from its majuscule counterpart Χ .
χ • (kh ) (lowercase , uppercase Χ
Lower-case chi (χεῖ Greek alphabet . It represented the voiceless aspirated velar plosive /kʰ/ and later the voiceless velar fricative /x/ . It is preceded by φ and followed by ψ . See also chi
( 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 ϝ Ͷ ͷ Ͱ ͱ Ϻ ϻ Ϙ ϙ Ͳ ͳ ( punctuation ) · ; ( diacritics ) ᾿ ῾ ◌́ ◌̀ ῀ ¨ χ • (ch ) (lowercase , uppercase Χ
The lower case letter chi (χι ), the 22nd letter of the modern Greek 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 ϝ Ͷ ͷ Ͱ ͱ Ϻ ϻ Ϙ ϙ Ͳ ͳ ( punctuation ) · ; ( diacritics ) ᾿ ῾ ◌́ ◌̀ ῀ ¨ χ΄ ͵χ 
χ on Wikipedia.Wikipedia