a character vector, the name of the country. a2. a character vector, two-letter country codes (aka alpha-2) which are the most widely used of the three, and used most prominently for the Internet's country code top-level domains (with a few exceptions). a3

These contain the 2- and 3-letter ISO code, the official name, the (possibly shorter) name used in the map data base, and the sovereign country. Details The ISO 3166-1 standard identifies countries by a 2 and 3 letter codes.
A 2 letter country code – defined under ISO 3166; 2 check digit – defined under ISO/IEC 7064; Up to 30 alpha-numeric characters – which is made up of the Basic Bank Account Number (BBAN) The BBAN number indicates an account at a bank in a particular country – it is typically made up of a bank identifier, sort code and account number
Of course, this will only be a iso 639-1 2-lettercode if there is one defined for this language, otherwise it may return a 3-letter code (or even longer). Your code will give silly results if you have a locale without language code (like _DE ) (mine will then return the empty string, which is a bit better, IMHO).

Recommended flags for each country code, including alternates for specific use cases. Two sample images for each flag, one at the official legal ratio and one at a uniform 2:3 ratio. Notes on how flag images should be drawn, with the most common errors called out. Warnings about political or legal controversies around certain flags.

E.212 mobile country code — NATO three-letter code — NATO two-letter code — LOC MARC code — ITU Maritime ID — ITU letter code — FIPS country code — License plate code. GBA. GS1 GTIN prefix — UNDP country code — WMO country code — ITU callsign prefixes —
The ISO 3166-1-Alpha-2 or 2 letter country code for Australia is AU, while the ISO 3166-1-Alpha-3 or 3 letter country code for Australia is AUS. The dialing code or calling code for Australia is +61. When making a phone call to Australia, you would need to dial this code before entering the local phone number. nvWCia.
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    • is there a 2 letter country code