Why is the culture name for English (Caribbean) “en-029”?

Question

Why is the culture name for English (Caribbean) \"en-029\"?

I know \"en-CA\" is used for English (Canada), but why 029? What does it signify? Why was it chosen?

Answer 1

Michael Kaplan (aka Microsoft's Unicode guru) just wrote a blog post about that last week.

EDIT

And actually, if you read the comments you'll see that 029 isn't even an ISO 3166 code because ISO 3166 is only about countries. That's where UN M.49 comes in which defines codes that specify:

a wide variety of geographical, political, or economic regions, like a continent, a country, or a specific “group of developing countries”.

And that's where you get code 029 for Caribbean.