Thought you might be the one to ask. Do you know of any connection between Arab algebra and zairjas mentioned here?
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On the calculating devices of Llull and Leibniz:
publicdomainreview.org/essay/let-us-c
Traces the origin of this method to medieval Arabic divination boards called “Zairjas” (زايرجة) likely a Persian portmanteau of zaicha (horoscope) + daira (circle).
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