Greek Capital Letter Lambda Λ

The Greek Capital Letter Lambda character (Λ) is a standard HTML entity defined in the HTML specification. In HTML source code, it can be written using the named entity reference Λ, the decimal numeric character reference Λ, or the hexadecimal numeric reference Λ. The character is assigned Unicode code point U+039B in the Universal Character Set.

Greek capital lambda (Λ) has an inverted-V shape distinct from Latin letters. It represents the cosmological constant in physics, the diagonal matrix of eigenvalues in linear algebra, and is the symbol for the Lambda baryon in particle physics. The Λ shape is iconic and used in numerous logos.

Greek letter entities are indispensable for scientific papers, engineering documentation, statistical analyses, and mathematical content published on the web. From physics equations using alpha and omega to statistical formulas featuring sigma and mu, these entities allow content authors to include Greek characters reliably without requiring specialized fonts or complex Unicode input methods on the keyboard.

When deciding how to encode the Greek Capital Letter Lambda character in your HTML documents, the named entity Λ is generally the most readable choice for developers reviewing or maintaining source code. The decimal form Λ and hexadecimal form Λ are equally valid alternatives that work in contexts where named entities may not be supported, or when generating HTML output programmatically from server-side code. All three representations produce identical visual output in every modern web browser.

Use the capital lambda entity in cosmology (cosmological constant Λ), linear algebra (eigenvalue matrix), and particle physics. Its distinctive shape makes it visually recognizable and it has been adopted as a symbol in various cultural and organizational contexts.