Who knew about this Roman numeral for ten thousand? ↂ
And apparently there's one for a hundred thousand too: ↈ

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@christianp I did not know about that, but I did know about the uncircled older "CIƆ" numeral instead of M for 1000. One of the theories about the origin of the $$\infty$$ symbol is that it came from this numeral.

@11011110 @christianp I've only seen those while geeking out over Unicode character lists! The Roman number system was obviously invented by people who couldn't conceive of a reason to count to more than a few hundred, and had to be retrofitted with extra stuff as their empire grew.

@y6nH @11011110 I'm not sure about that - even the Minoans had a symbol for 10,000.

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