More history here on the page than I would have thought. Definitely worth digging into some of the older examples going back to Conrad Gessner and Johann Jacob Moser.
Zettelkasten - Wikipedia | syndication link
- broader terms (BT): tools for thought
- narrower terms (NT): Zettelkästen
- related terms (RT): history of the Zettelkasten
- used for (UF) or aliases: