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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.
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.
99.3 is "ninety-nine point three"; or "ninety-nine and three tenths" (U.S., occasionally). In English the decimal point was originally printed in the center of the line (0·002), but with the advent of the typewriter it was placed at the bottom of the line, so that a single key could be used as a full stop/period and as a decimal point.
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.
However, this usage had already been declining since the 1968 ruling by the Ministry of Technology to use the full stop as the decimal point, [3] not only because of that ruling but also because it is the widely-adopted international standard, [4] and because the standard UK keyboard layout (for typewriters and computers) has only the full stop ...
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.
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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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