A decimal mark is a symbol used to separate the whole part from the fractional part of a number written in decimal form.
Different cultures use different symbols for the decimal mark. The choice of symbol for the decimal mark also affects the choice of symbol for the thousands separator used in digit grouping, so the latter is also treated in this article.
In mathematics the decimal mark is a type of radix point, a term that also applies to number systems with bases other than ten.
Read more about Decimal Mark: History, Digit Grouping, Influence of Calculators and Computers, Other Numeral Systems, Examples of Use
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—David Elkind (20th century)
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—Ralph Waldo Emerson (1803–1882)