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Well they are sun symbols. I guess if you are asking how are they produced, they are embedded SVG in the CSS at https://gwern.net/static/css/style.css

see for instance --GW-image-sun-verginasun-black-svg

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Do they have a special name? I haven’t seen them in books.

they probably do, I've seen that kind of thing (a logo) placed throughout the text before now, but more of a fancy print rather than cheap paperbacks. In the old days it would have cost more, but since DTP took over then I don't see why that would be a problem. perhaps just "paragraph divider", eg https://www.vecteezy.com/vector-art/12217904-collection-set-...

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