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sigma US English

The eighteenth letter of the Greek alphabet (Σ, σ), transliterated as ‘s.’

sigma New Oxford Dictionary for Writers & Editors

eighteenth letter of the Greek alphabet (𝚺, 𝛔), transliterated as ‘s’

Sigma in sigma US English

The eighteenth star in a constellation

Σ in sigma US English

Mathematical sum

lunate sigma in sigma US English

The eighteenth letter of the Greek alphabet (Σ, σ), transliterated as ‘s.’