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Lambda

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

Lambda (upper case Λ, lower case λ) is the 11th letter of the Greek alphabet. In the system of Greek numerals it has a value of 30.

The upper-case letter Λ is used as a symbol for:

• The lambda particles in particle physics.

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

• The wavelength of a wave in physics.
• The radioactive decay constant.
• The Lambda phage virus in biology.
• Eigenvalues in linear algebra
• The definition of anonymous functions in lambda calculus and, by extension, some programming languages.
  • The language Unlambda is made up completely of lambdas, but they cannot be stored, hence the un-.
• Gay pride (explanations for this usage vary).
• The Half-Life computer game.
• Air to fuel ratio in an internal combustion engine.