A downloadable mystery

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Hey. I found this while clearing my grandma's attic. She was always quite nerdy but this is stumping me. Anyone have any idea what it is?

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IndexAbacus.png 2.3 MB

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Maybe your grandma was a cryptographer. I'm not, but it reminds me of ciphers I've seen. These circles and dots combine in so many different ways, though, that there must be more possible characters than just Latin letters. Who knows what it could mean! It's very artful, though.