Decimal and, only the best mathematicians were able to multiply or divide large numbers. These difficulties were completely solved with the introduction of the Hindu–Arabic numeral system for representing integers. This system has been extended to represent some non-integer numbers, called "decimal fractions" or "decimal numbers" for forming the "decimal numeral system". For writing numbers, the decimal system uses ten decimal digits, a decimal mark, and, for negative numbers, a minus sign "−". The decimal digits are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9; the decimal separator is the dot "" in many countries (including English speaking ones),
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