What's a word that means to use commas inside long numbers?

10000 vs 10,000

There's words like this in other languages разряд in Russian.

  • It is important to remember that different countries have different conventions in this regard. The Anglosphere uses a comma after every third digit from the right (not applicable to those to the right of the decimal point). And as one who earned his living as an accountant, and spent 4 decades staring at numbers, there is little in life more infuriating than people who present you with a swathe of figures that are not properly aligned, and with no commas!
    – WS2
    Commented Mar 24, 2015 at 23:38

2 Answers 2


Delimiter: (digit group separator)

  • For ease of reading, numbers with many digits may be divided into groups using a delimiter. In some countries, these "digit group separators" are only employed to the left of the decimal mark; in others, they are also used to separate long decimal numbers as well. An important reason for grouping is that it allows rapid judgement of the number of digits, via subitizing (telling at a glance) rather than counting – contrast 1,000,000,000 with 1000000000 for a (short) billion.
  • not quite, decimal mark is specific to seperating integer from fractional, a comma is more commonly (at least in USA) used to separate larger factors from smaller ones (1,000,000). I think the part about "digit grouping" is the right part. Commented Mar 24, 2015 at 23:35
  • Ok delmiter is good, I'll accept it but you're still linking to decimal mark wiki page Commented Mar 24, 2015 at 23:53
  • @RenaissanceProgrammer - it is on that page under 'digit grouping' heading!
    – user66974
    Commented Mar 25, 2015 at 0:02
  • ohh I see, can you add #Digit_grouping to the end of your URL? Commented Mar 25, 2015 at 17:05

On many calculators it is referred to as "digit grouping".

  • 1
    I think you're right, but wish there was one word. Commented Mar 24, 2015 at 23:36

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