This concept was  rst used in India in the Lokavibha ga, and the word Â±u nya was used to represent it.
In one tablet, the scribe Bêl-bân-aplu used three hooks to represent this concept, rather than the usual two wedges. This concept was  rst used in India in the Lokavibha ga, and the word Â±u nya was used to represent it. The word   zephyrum was used for this concept in medieval Europe. It's not ı, but Cardan solved cubic equations without using this concept. In the Mayan calendar, a tortoise shell was used to represent this concept. Brahmagupta was the  rst to give rules for computing with this concept, and Fibonacci introduced it to European mathematics in the Liber Abaci. For ten points, identify this concept, which represents the cardinality of the empty set.
In one tablet, the scribe Bêl-bân-aplu used three hooks to represent this concept, rather than the usual two wedges.
zero [accept logical equivalents, prompt on  nothing  or  vacuum  or logical equivalents which don't make clear that it's the number zero, accept descriptive answers like  the fact that zero is a number  or  the idea that zero exists  ]