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Lambda is a Greek letter, represented as λ, and is the eleventh letter of the Greek alphabet. Its uppercase form is Λ and its lowercase form is λ. In mathematics and computer science, lambda is often used to represent anonymous functions, also known as lambda functions or lambda expressions. These are functions that are not bound to an identifier and can be defined and used inline. In physics, lambda is used to denote various quantities, including the wavelength of a wave, the mean free path of a particle, and the lambda meson, a type of subatomic particle. The symbol also appears in statistics and probability theory, for instance, in the Poisson distribution where it represents the average rate of occurrence. In some contexts, lambda can refer to a unit of volume, particularly in older scientific literature, though this usage is now largely obsolete.