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What is the proper name or terminology of notation for using a comma to separate and group thousandths of a number?

As in, formatting large numbers for readability:

comma delimited    real number           1,000           1000          10,000          10000         100,000         100000       1,000,000        1000000 

How would you refer to this grouping of every third digit?

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    https://en.wikipedia.org/wiki/Decimal_mark#Digit_grouping2012-04-09

2 Answers 2

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Thousand separation or digit grouping.

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Perl users use the term "commify", probably a reference to "sub commify" in the Perl FAQ "How can I output my numbers with commas added?".