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Decimal separator

symbol used to separate the integer part from the fractional part of a number written in base 10

The decimal separator is a symbol used to mark the border between the integral and the fractional parts of a decimal numeral. This symbol can be a period or a comma. Decimal point and decimal comma are common names for the decimal separator. For example 9.5 means nine and one half in English speaking countries. In many countries, the same number would be written as 9,5.