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https://en.wikipedia.org/wiki/Summation
http://www.columbia.edu/itc/sipa/math/summation.html
https://www.mathsisfun.com/algebra/sigma-notation.html
https://en.wiktionary.org/wiki/%CE%A3
https://fsymbols.com/signs/sigma/
https://www.quora.com/What-is-the-symbol-sum
https://www.quora.com/What-is-the-math-symbol-of-the-sum-of
http://tutorial.math.lamar.edu/Classes/CalcI/SummationNotation.aspx
https://www.hec.ca/en/cams/help/topics/The_summation_symbol.pdf
https://datascience.stackexchange.com/questions/27298/recreating-the-sum-symbol-using-python
https://math.stackexchange.com/questions/1342188/what-is-the-mathematical-symbol-for-the-sum-of-numbers
https://tex.stackexchange.com/questions/12344/separate-long-math-text-under-sum-symbol-into-different-lines
https://math.stackexchange.com/questions/2083774/summation-symbol-with-just-one-letter-below-it-how-to-verbally-state