Sigma is the eighteenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 200. The letter is widely used in many scientific disciplines: physics, chemistry, biology and quantum mechanics. The Greek alphabet has an important r Stock Image

Stock Image - Sigma is the eighteenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 200. The letter is widely used in many scientific disciplines: physics, chemistry, biology and quantum mechanics. The Greek alphabet has an important r. Fotosearch

Sigma is the eighteenth letter of the Greek alphabet. In the system of Greek numerals it has a value of 200. The letter is widely used in many scientific disciplines: physics, chemistry, biology and quantum mechanics. The Greek alphabet has an important r

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