Six Sigma Symbol

Six sigma symbol is a combination of the number 6 and the lower-case Greek letter σ which stands for standard deviation in statistics.This is a symbol of a quality improvement methodology which uses a variety of management tools (diagrams) and statistical analysis methods to remove defect causing variation from manufacturing and service delivery processes leading to increased customer satisfaction and profitability. 

Find various six sigma logos in this gallery ranging from green to multi color combinations.

The are other symbols which are frequently used throughout lean six sigma projects. It is important to be familiar with these symbols not only for six sigma certification candidates pursuing self guided six sigma training but also for long time practitioners

​Lower case Greek letter Sigma denotes standard deviation in statistics. S and SD letters are also used to denote this measure of data dispersion

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Lower case Mu is used to denote population mean

​Xbar is used to denote a sample mean