What does sigma stand for in six sigma?

Its a statistical term for standard diviation in normal distribution if there are six standard deviations between the process mean and the nearest specification limit, then there is a 99.99966% probability that no items will fail to meet specifications In six sigma 1.5 sigma correction is considered to allow the natural variation present in any process. So when we say that process is sis sigma , it is nactually 4.5 sigma.

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