zephirum/zero/0

Noun
zephirum

1. (Medieval Latin, mathematics) zero
   • 1202, Leonardo Fibonacci, Liber Abaci, Chapter I.:
     Cum his itaque novem figuris, et cum hoc signo 0, quod arabice zephirum appellatur, scribitur quilibet numerus, [...]
     With these nine figures, and with this sign 0, which is called zero in Arabic, any number can be written, […]​

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Leonardo is famous for the Fibonacci Sequence, which is pictured in geometric form above and in arithmetic form below.
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0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 … The next number is found by adding up the two numbers before it.

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