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Xi (upper case Ξ, lower case ξ) is the 14th letter of the Greek alphabet. It is pronounced ksee by modern Greeks. In the system of Greek numerals it has a value of 60.

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

Random Variables
Extent of Reaction (a topic found most often in chemical engineering kinetics)

The upper-case letter Ξ is used as symbol for:

The 'cascade particles' in particle physics.

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

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