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By 130 AD, Ptolemy, influenced by Hipparchus and the Babylonians, was using a symbol for 0 within a sexagesimal numeral system otherwise using Once upon a time there was a girl who really loved skiing poster alphabetic Greek numerals. Because it was used alone, not as just a placeholder, this Hellenistic zero was the first documented use of a true zero in the Old World. In later Byzantine manuscripts of his Syntaxis Mathematica , the Hellenistic zero had morphed into the Greek letter Omicron Another true zero was used in tables alongside Roman numerals by 525 , but as a word, nulla meaning nothing, not as a symbol. When division produced 0 as a remainder, nihil, also meaning nothing, was used. These medieval zeros were used by all future medieval computists . An isolated use of their initial, N, was used in a table of Roman numerals by Bede or a colleague about 725, a true zero symbol.