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https://en.wikipedia.org/wiki/Sigma
https://en.wikipedia.org/wiki/List_of_common_physics_notations
https://physics.info/symbols/
https://www.youtube.com/watch%3Fv%3Dzg-gxekFIA8
https://en.wiktionary.org/wiki/%25CF%2583
https://www.physicsforums.com/threads/what-is-sigma.23592/
https://study.com/academy/lesson/what-is-sigma-definition-lesson-quiz.html
https://www.khanacademy.org/math/algebra2/sequences-and-series/alg2-sigma-notation/v/sigma-notation-sum
https://fsymbols.com/signs/sigma/
https://www.mathsisfun.com/algebra/sigma-notation.html
https://www.electrobionics.org/symbols.html
http://www.google.com.pk/url?url=http://spot.pcc.edu/~dulrich/resources/notations.pdf
https://mathlesstraveled.com/appendices/sigma-notation/