links 8/6/25: https://roamresearch.com/#/app/srcpublic/page/08-06-2025
https://en.m.wikipedia.org/wiki/Playing_card_suit European playing card suits historically differed; the familiar hearts/clubs/spades/diamonds is French, but in Southern Europe they used tarot-style clubs, cups, swords, and coins.
https://en.m.wikipedia.org/wiki/The_Queen_of_Spades_(opera)
https://en.m.wikipedia.org/wiki/Ronald_Fisher
links 8/6/25: https://roamresearch.com/#/app/srcpublic/page/08-06-2025
https://en.m.wikipedia.org/wiki/Playing_card_suit European playing card suits historically differed; the familiar hearts/clubs/spades/diamonds is French, but in Southern Europe they used tarot-style clubs, cups, swords, and coins.
https://en.m.wikipedia.org/wiki/The_Queen_of_Spades_(opera)
https://en.m.wikipedia.org/wiki/Ronald_Fisher