Generally, real numbers can be expressed mathematically, and symbols representing angles can also be used.

Chinese transliteration of Lambda: Lambda

Used as a symbol:

Capital λ is the symbol for λ baryon in particle physics.

Lowercase λ is used for: physical wavelength symbol.

Radioactive decay constant

Eigenvalues in linear algebra

The л of the Cyrillic alphabet evolved from Lambda.

It is also used in computer programming languages and game movies.