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The Italian word zefiro was already in existence (meaning "west wind" from Latin and Greek zephyrus) and may have influenced the spelling when transcribing Arabic ṣifr.
There are different words used for the number or concept of zero depending on the context.
The way in which it is used can be seen in his table of chords in that book.
By 130 AD, Ptolemy, influenced by Hipparchus and the Babylonians, was using a symbol for zero (a small circle with a long overbar) in his work on mathematical astronomy called the Syntaxis Mathematica, also known as the Almagest.They asked themselves, "How can nothing be something?", leading to philosophical and, by the medieval period, religious arguments about the nature and existence of zero and the vacuum.1170–1250), who grew up in North Africa and is credited with introducing the decimal system to Europe, used the term zephyrum.
This became zefiro in Italian, and was then contracted to zero in Venetian.and the numerical digit used to represent that number in numerals.