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There are quite a few English-language locales on my computer system (Windows 10). Most of them look like this, and make sense:
en_CA
en_DE
en_GB
en_IL
en_PK
en_US
...
But there are three special ones, which don't seem to correspond to a clear physical area:
en_001
en_150
en_US_POSIX
By doing some digging, I have extracted out the following "display names" for them (in order):
World
Europe
United States
Okay, so "001" means "World", "150" means "Europe" and "US_POSIX" means "United States", just as "en_US" already does?
What is the point of the duplicate "en_US" locales, and what is "World" and "Europe"?
It should be noted that numbers seem to be formatted just like in the US variants for both "World" and "Europe", which is unexpected. I thought they were gonna be using spaces for thousands delimiters, as I thought was considered the "international" standard, but they use commas, just like in the USA/UK:
123,456,789
The exact formats used are specified in ICU Locale “American English (Computer)” (en_US_POSIX), ICU Locale “English (World)” (en_001), and ICU Locale “English (Europe)” (en_150)
– DavidPostill – 2020-01-23T10:35:12.300