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What I'm talking about is a kind of discovery fiction, a plausible line of reasoning that might have led you to the discovery of arabic numerals, with roughly the set of raw materials on hand in ancient rome.
Unfortunately, although of course I know an answer - arabic numerals! - I got pretty stuck. Everything I tried required some implausible leap, access to some idea that is only obvious _because_ we have arabic numerals.
Binary numbers were represented in China concurrent with Roman times, though as far as I know, no westerner prior to Liebniz paid attention (I'm probably wrong about that though)
Romans also knew of the many greek numeral systems https://en.m.wikipedia.org/wiki/Greek_numerals …
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