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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.
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.
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.
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)
It is the extension to non-integer numbers (decimal fractions) of the Hindu–Arabic numeral system. The way of denoting numbers in the decimal system is often referred to as decimal notation. [2] A decimal numeral (also often just decimal or, less correctly, decimal number), refers generally to the notation of a number in the decimal numeral ...
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French decimal clock from the time of the French Revolution. The large dial shows the ten hours of the decimal day in Arabic numerals, while the small dial shows the two 12-hour periods of the standard 24-hour day in Roman numerals. Decimal time is the representation of the time of day using units which are decimally related.