Clocks? Is the answer "clocks"?
Because the lower numbers are more common, not so surprising to allocate characters for some low numbers but not _all_ numbers, but then why twelve, and not ten or thirteen or fifteen or twenty?
Clocks go to twelve and are often marked with roman numerals.
12 is prolly the most subdivisions of a circle that most people can perceive.
that's my guess
sorry, you were talking about unicode (not time & clocks)
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