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Symbol-specific names are also used; decimal point and decimal comma refer to a dot (either baseline or middle) and comma respectively, when it is used as a decimal separator; these are the usual terms used in English, [1] [2] [3] with the aforementioned generic terms reserved for abstract usage.
For this reason, ISO 31-0 specifies that such groups of digits should never be separated by a comma or point, as these are reserved for use as the decimal sign. For example, one million (1000000) may be written as 1 000 000. For numbers whose magnitude is less than 1, the decimal sign should be preceded by a zero.
Grouping with commas Left of the decimal point, five or more digits are grouped into threes separated by commas (e.g. 12,200; 255,200 km; 8,274,527th; 1 ⁄ 86,400). Numbers with exactly four digits left of the decimal point may optionally be grouped (either 1,250 or 1250), consistently within any given article.
The comma in the Arabic script used by languages including Arabic, Urdu, and Persian, is "upside-down" ، (U+060C ، ARABIC COMMA), in order to distinguish it from the Arabic diacritic ḍammah ُ representing the vowel /u/, which is similarly shaped. [40] In Arabic texts, the Western-styled comma (٫) is used as a decimal point.
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The difference between an Oxford comma and a regular comma is that an Oxford comma refers to the final comma in a series that would come before the last conjunction of a sentence. In contrast, a ...
More generally, a decimal with n digits after the separator (a point or comma) represents the fraction with denominator 10 n, whose numerator is the integer obtained by removing the separator. It follows that a number is a decimal fraction if and only if it has a finite decimal representation.
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