Michael Bimmler
To answer K. Peachey's question: Yes, obviously "currency shorthand" or whatever would have been better (did the survey really just say "ISO currency code"? I'm too lazy to check but this would really be a usability mistake...)
Or it could have just said "currency" (which is probably what it did say) but present to the user a drop-down list of the *names* of the currencies to select from, taken, perhaps, from the fourth column of the table at [[ISO 4217]].
(But the image at the top of that page suggests another way that even an American might find a currency code in common use. I think I've seen "USD" on airline tickets, too.)