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IV — four; I̅V̅ — four thousand; I̿V̿ — four million
2019 April, Evander Lewis Price, “ Conclusions: The Interval”, in Future Momentality (in English), Cambridge, Mass.: Harvard University, page 173:
Their [the Long Now Foundation’s] logo—you can’t miss it—is the decem milia, the monolithic (and chronolithic) Roman numeral for ten thousand. X marks the clock: X̄
(Greek numerals) In Byzantine Greek and in Coptic, converts a letter into a digit. E.g. κ̅ (modern κʹ) '20'.
(phonetics) marks a string of syllables or segments with high pitch. Compare ˹ ... ˺.
Roman numerals § Vinculum on Wikipedia.Wikipedia 