letter code. Some people have used telephone company country codes,
but country does not equal language, e.g. Switzerland. I believe DOS
That's ok, telephone company country codes don't even equal country.
They are originally pairwise--the code that I dial to get from my
country to get to your country, which might differ from the code dialed
from another country to get to your country. There has been an effort
to rationalize this over the last few years so people can put phone
numbers into correspondence that will travel internationally, but the
list of exceptions is still quite impressive.