The capital Greek letter (capital lambda).
Symbol  Format  Data 

Λ  Unicode 

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SVG 
The Greek Alphabet is used throughout math to represent variables, constants, and coeffecients within math expressions, formulas, and equations.
The Greek letter lambda (λ) is used throught mathematics, computer science, and physics. The symbol is used to represent the wavelength of a wave. In computer science, the symbol is used in the study of "lambda calculus" and anonymous functions.