The Cistercian numerals are a forgotten number system, developed by the Cistercian monastic order in the early thirteenth century, much more compact than Arabic or Roman numerals: with a single character you could write any integer from 1 to 9999 [more: https://t.co/8TS1FZChbW] pic.twitter.com/tehyfxmy2n

— Massimo (@Rainmaker1973) October 24, 2022