The Decimal point reference article from the English Wikipedia on 24-Apr-2004
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Decimal point

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The decimal point is used to mark the boundary between the integer and the fractional parts of a decimal numeral. In most English speaking countries, a dot (.) is used as the decimal symbol. In many non-English speaking countries a decimal comma (,) is used instead. For numeral systems other than decimal, the analogous point is known as a radix point.

Example usage: