Decimal the Roman numerals did, an intermediate base of 5. Notably, the polymath Archimedes (ca. 287–212 BC) invented a decimal positional system in his Sand Reckoner which was based on 10 and later led the German mathematician Carl Friedrich Gauss to lament what heights science would have already reached in his days if Archimedes had fully realized the potential of his ingenious discovery. The Hittites hieroglyphs (since 15th century BC), just like the Egyptian and early numerals in Greece, was strictly decimal. Some non-mathematical ancient texts like the Vedas dating back to 1900–1700 BCE make use of decimals and mathematical decimal
Point and figure chart subject. A detailed history can be found in Jeremy du Plessis’ ‘The Definitive Guide to Point and Figure’ where many references and examples are cited. Du Plessis describes the historical development of these charts from a price recording system to a charting method. Traders kept track of prices by writing them down in columns. They noticed patterns in their price record and started referring to them first as ‘fluctuation charts’ and then as ‘figure charts’. They started using Xs instead of numbers and these charts became known as ‘point charts’. Traders used both point charts and figure charts together and