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https://www.quora.com/How-do-I-insert-a-sigma-symbol-into-a-word-document
https://www.dummies.com/software/microsoft-office/word/how-to-insert-special-characters-and-symbols-in-word-2010/
https://fsymbols.com/signs/sigma/
https://wordinfo.info/unit/1958
https://en.wikipedia.org/wiki/Sigma
https://en.wiktionary.org/wiki/%CF%83
https://www.officetooltips.com/powerpoint_2016/tips/how_to_insert_greek_symbols_very_quickly.html
https://support.office.com/en-us/article/insert-mathematical-symbols-91a4b04c-84a8-4de9-bd13-8609e14bed58
https://support.office.com/en-us/article/insert-a-symbol-be6f1bbf-5bdd-42dc-a5e3-ab5e7d84a4f8
https://www.techwalla.com/articles/how-to-make-a-sigma-on-your-keyboard
https://personal.eur.nl/wakker/miscella/maths.with.msword/symbolshp.pdf
https://answers.microsoft.com/en-us/msoffice/forum/all/decrease-the-size-of-summation-symbol-in-an/475760ac-800e-4c75-9e51-3e594dfd32c4
https://discussions.apple.com/thread/5286656