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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 Transliterated S Ancient Pronunciation: s as sense This came from the Semitic alphabet, where it was once shaped like our W. (The Hebrew shin, familiar to most people from Jewish religious objects, is the same letter.) The letter was turned to make the classical Greek sigma. The Greek sigma in turn was altered slightly as our s. At the end of a word, lower-case sigma was written as our lower-case s.