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https://en.wikipedia.org/wiki/Blackboard_bold
https://tex.stackexchange.com/questions/223254/large-blackboard-bold-r-operator-with-text-underneath
http://encyclopedia.kids.net.au/page/bl/Blackboard_bold
https://academickids.com/encyclopedia/index.php/Blackboard_bold
https://cocazero.ds5.re/aacbk/latex-cursive-r-5289f8
http://grncarijafurunovic.com/car-power-tsxte/latex-circle-number.html
http://luc.devroye.org/blackboard.html
http://www.winedt.org/old/Macros/LaTeX/FasTeX/FasTeX_Shortcuts_List.pdf
https://assets.ctfassets.net/nrgyaltdicpt/4e825etqMUW8vTF8drfRbw/d4f3d9adcb2980b80818f788e36316b2/A_quick_guide_to_LaTeX__Overleaf_version.pdf
https://mathvault.ca/hub/higher-math/math-symbols/greek-hebrew-latin-symbols/
http://tug.ctan.org/macros/latex/contrib/boldtensors/boldtensors.tex
https://www.explainxkcd.com/wiki/index.php/2309:_X