The small letter sigma () is used to represent standard deviation. The Greek letter sigma was derived from the Phoenician letter n, meaning tooth. The alternative form of sigma () must be used in word-final position. Specification Limits are derived from the customer requirements, and they specify the minimum and maximum acceptable limits of a process. Sigma (uppercase, lowercase ) is the 18th letter of the Modern Greek alphabet. It tells us that we are summing something. Unpacking the meaning of summation notation This is the sigma symbol: displaystylesum. That's because some of the continuous functions $f : \rightarrow \mathbb(f)$. Six Sigma stands for 6 standard deviations (6) between avarage and acceptable limits LSL and USL stand for Lower Specification Limit and Upper Specification Limit respectively. Summation notation (or sigma notation) allows us to write a long sum in a single expression. However, if you think about it for a moment, you'll see that neither of your suggested definitions of "between" allow for a terse and correct statement of the Intermediate Value Theorem. Captial sigma () applies the expression after it to all members of a range and then sums the results.
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