Japanese numbers used to be delimited with commas every four digits, like so: 1,0000,0000 due to the largest common single-use (i.e., not a combination of a small number plus a large number as in "hundred thousand") being 10,000 (δΈ, man).
Nowadays I've only ever seen US-style commas and it's hard to even find a reference to the four-digit commas online.
Nowadays I've only ever seen US-style commas and it's hard to even find a reference to the four-digit commas online.