Sigma (disambiguation)Topics referred to by the same term / From Wikipedia, the free encyclopedia Sigma (Σ or σ, word-final lowercase ς) is the 18th letter of the Greek alphabet. Look up sigma, Sigma, Σ, σ, or ς in Wiktionary, the free dictionary. Sigma may also refer to:
Sigma (Σ or σ, word-final lowercase ς) is the 18th letter of the Greek alphabet. Look up sigma, Sigma, Σ, σ, or ς in Wiktionary, the free dictionary. Sigma may also refer to: