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The most interesting exotic numeral systems I know of are Cistercian numerals [1] and Indic [2] and Ottoman [3] Siyaq numbers. The latter two were even added to Unicode 14.0 [3][4], but not many fonts support them.

[1]: https://en.m.wikipedia.org/wiki/Cistercian_numerals

[2]: https://en.m.wikipedia.org/wiki/Indic_Siyaq_Numbers

[3]: https://en.m.wikipedia.org/wiki/Ottoman_Siyaq_Numbers

[4]: https://unicode.org/charts/PDF/U1ED00.pdf

[5]: https://unicode.org/charts/PDF/U1ED00.pdf