♲ @fermatslibrary@twitter.com: "The nine Indian figures are:

9 8 7 6 5 4 3 2 1

With these nine figures, and with the sign 0 which the Arabs call zephir any number whatsoever is written"

Leonardo Fibonacci introducing the Hindu–Arabic numeral system to Europe with his book Liber Abaci in 1202. https://loadaverage.org/attachment/4925541