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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

Six Sigma US English

A set of management techniques intended to improve business processes by greatly reducing the probability that an error or defect will occur

lunate sigma in sigma US English

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