Xi

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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