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There are three sigma symbols, an upper case, a lower case and an end of the sentence case.

The capital letter case is used as summation.

The lower case is used to represent variance in statistics.

The lower case is also used to represent stress in mechanics and physics.

The end of sentence case is generally not used.

Reference link: http://en.wikipedia.org/wiki/Sigma.

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Q: What does the sigma symbol mean?
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