Pentimal system

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Edward Larsson's notes from 1885 show the use of "pentadic" runic numerals to replace the Arabic numerals in representing dates.
Edward Larsson's notes from 1885 show the use of "pentadic" runic numerals to replace the Arabic numerals in representing dates.

Pentimal system (Swedish pentadiska siffor) is a number format similar to the decimal system, used in Scandinavia in medieval times, especially in (English) runstavar or Runic calendars (also known as clogs) and Norwegian kalenderstavar. This is a calendar system, presumably derived from the Roman calendar.

The oldest known use of the numbers in a printed source is a calendar, the Computus Runicus by Ole Worm from 1643. [1]

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