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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.
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.
Do not write #1; number one works instead. Comic books are an exception. Write 12,000 for twelve thousand, not 12.000; conversely, decimal points are thus: 3.14, not 3,14. Both 10 June 1921 and June 10, 1921, are correct, but should be consistent within an article. A comma is not used if only the month is given, such as June 1921. Avoid ...
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), provided that this is consistent within each article....
European languages that use the comma as a decimal separator may correspondingly use the period as a thousands separator. As a result, some style guides [example needed] recommend avoidance of the comma (,) as either separator and the use of the period (.) only as a decimal point. Thus one-half would be written 0.5 in decimal, base ten notation ...
Actually, they've been around for at least several decades. Since it's inappropriate to use commas after the decimal point (or comma), a space is inserted after each group of three digits to enhance readability and reduce transcription errors. I didn't know that it had made it into an ISO, though. Askari Mark 02:28, 12 August 2007 (UTC)
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The comma is used to avoid confusing consecutive numbers: December 19 1941. Most style ... a number of comma-like diacritics ... comma (٫) is used as a decimal point.