fonts create custom symbol - SERP Analysis

https://community.esri.com/t5/arcgis-pro-questions/create-custom-character-symbols-as-a-font/td-p/1522873

https://www.mobomo.com/2012/04/symbol-font/

https://www.quora.com/Can-one-create-arbitrary-symbols-and-add-them-to-a-font

https://www.reddit.com/r/kustom/comments/q65fjq/tutorial_how_to_create_your_own_icon_font/

https://blogs.ucl.ac.uk/research-software-development/creating-custom-font-symbols/

https://fontello.com/

https://answers.microsoft.com/en-us/msoffice/forum/all/how-to-create-a-new-symbol/a7d0028f-2c3e-4a85-a0aa-d4c03a353b74

https://forums.autodesk.com/t5/autocad-forum/creating-custom-text-symbols/td-p/7288488

https://www.reddit.com/r/MicrosoftWord/comments/rbrkmb/can_i_create_my_own_unique_special_characters_to/

https://coolsymbol.com/