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A point or a comma, depending on the country.
Also known as: Decimal comma, Decimal point
About half the world writes a decimal point and about half a decimal comma, and each uses the other mark as a thousands separator. The same string of digits therefore names two numbers differing by a factor of a thousand, which is why international standards recommend a thin space for grouping.
Separates the whole and fractional parts of a number, written as a point in some countries and a comma in others.
Contexts: History
Reverses meaning between conventions, so a figure written with both marks can be read as two numbers differing by a factor of a thousand.
Contexts: History
Is why international standards recommend a thin space rather than either mark for grouping digits.
Contexts: History
A single small dot or a comma set between digits at the baseline of a numeral.