Lambda is a letter taken from the Greek alphabet and is used as both a symbol and a concept in various fields of science, mathematics, and computing. In physics, lambda is mainly used as a variable to denote or indicate the wavelength of any wave. It is usually denoted by the Greek letter lambda (λ) . In nuclear physics and radioactivity, lambda is used to indicate the radioactivity decay constant. In terms of electric fields, lambda is also used to indicate the linear charge density of a uniform line of electric charge.

Lambda is also used in other fields, such as computer programming and cloud computing. In programming languages such as Python and Java, lambda is used to define anonymous functions. In mathematical logic and computer science, lambda is used to introduce anonymous functions expressed with the concepts of lambda calculus.

In summary, lambda is a versatile symbol used in various fields of science, mathematics, and computing. In physics, it is mainly used to denote the wavelength of any wave, but it also has other uses in nuclear physics and electric fields. In computer programming, lambda is used to define anonymous functions.