λ:Lambda (capital λ, lowercase λ) Pronunciation: lan b(m) da (lambda) ['l? md？ ] is the eleventh Greek letter.

Capital λ is used for: the symbol of λ baryon in particle physics;

The lowercase λ is used for: physical wavelength symbols, decay constants in radiology, and eigenvalues in linear algebra. λ generally represents a real number in mathematics, and can also be used as a symbol representing an angle. It is also used to represent decay constants in radiology and normal distribution constants in statistics.