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Sigma notation, often referred to as summation notation, can be used in many common situations. For example, it can be used to calculate the sum of deposits for a bank account. Banks add together all deposits and withdrawals to determine the current balance.
sigma - the 18th letter of the Greek alphabet. Greek alphabet - the alphabet used by ancient Greeks. alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; his grandmother taught him his letters. Translations. sigma.