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ISO 80000-1 stipulates, “The decimal sign is either a comma or a point on the line.” The standard does not stipulate any preference, observing that usage will depend on customary usage in the language concerned, but adds a note that as per ISO/IEC directives, all ISO standards should use the comma as the decimal marker.
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 difference between metric time and decimal time is that metric time defines units for measuring time interval, as measured with a stopwatch, and decimal time defines the time of day, as measured by a clock. Just as standard time uses the metric time unit of the second as its basis, proposed decimal time scales may use alternative metric units.
One comma between the day and year, and one comma after the year (unless some other puncutation follows the year). See Chicago Manual of Style, Section 6.46: "In the month-day-year style of dates, the style most commonly used in the United States and hence now recommended by Chicago, commas are used both before and after the year.
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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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 ...