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"Use commas to separate elements in a series, but do not put a comma before the conjunction in a simple series. Put a comma before the concluding conjunction in a series, however, if an integral element of the series requires a conjunction: I had orange juice, toast, and ham and eggs for breakfast.
In many contexts, when a number is spoken, the function of the separator is assumed by the spoken name of the symbol: comma or point in most cases. [6] [2] [7] In some specialized contexts, the word decimal is instead used for this purpose (such as in International Civil Aviation Organization-regulated air traffic control communications).
The Oxford comma is the comma used before the final conjunction in a list of three or more items. When writing a list, of course, you'll include commas to separate items and show individuality.
Some people use the Oxford comma (also known as the Harvard or serial comma). This is a comma before "and" or "or" at the end of a series, regardless of whether it is needed for clarification purposes. For example: X, Y, and Z (with an Oxford comma) X, Y and Z (without an Oxford comma)
In general, the comma shows that the words immediately before the comma are less closely or exclusively linked grammatically to those immediately after the comma than they might be otherwise. The comma performs a number of functions in English writing. It is used in generally similar ways in other languages, particularly European ones, although ...
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.
So too are the thousands, with the number of thousands followed by the word "thousand". The number one thousand may be written 1 000 or 1000 or 1,000; larger numbers are written for example 10 000 or 10,000 for ease of reading. European languages that use the comma as a decimal separator may correspondingly use the period as a thousands separator.
The name of a number 10 3n+3, where n is greater than or equal to 1000, is formed by concatenating the names of the numbers of the form 10 3m+3, where m represents each group of comma-separated digits of n, with each but the last "-illion" trimmed to "-illi-", or, in the case of m = 0, either "-nilli-" or "-nillion". [17]