Lambda

Lambda (/ˈlæmdə/ ⓘ;[1] uppercase Λ, lowercase λ; Greek: λάμ(β)δα, lám(b)da) is the eleventh letter of the Greek alphabet, representing the voiced alveolar lateral approximant IPA: [l].

The ancient grammarians and dramatists give evidence to the pronunciation as [laːbdaː] (λάβδα) in Classical Greek times.

In early Greek alphabets, the shape and orientation of lambda varied.

Examples of the symbolic use of uppercase lambda include: Examples of the symbolic use of lowercase lambda include: The Roman libra and Byzantine lítra (λίτρα), which served as both the pound mass unit and liter volume unit, were abbreviated in Greek using lambda with modified forms of the iota subscript ⟨λͅ⟩.

[18] Latin versions of lambda were added to Unicode in 2024 for the Salishan and Wakashan languages in Canada.