Lambda
| Greek letters | |
| 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 |
| Greek alphabet | |
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 wavelength of a wave in physics.
- The radioactive decay constant.
- The Lambda phage virus in biology.
- 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.