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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 set of logical axioms in the axiomatic method of logical deduction in first-order logic

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 engineAn internal combustion engine is an engine that is powered by the expansion of hot combustion products of fuel directly acting within an engine. A piston internal combustion engine works by burning hydrocarbon or hydrogen fuel that presses on a piston; an