Proper currency format when not displaying the native currency of a culture

There’s no absolute rules here but a couple of guiding principles:

  1. Try and use the number format for that locale (eg 1,000.00 in the US would be displayed as 1’000,00 in Germany);
  2. Remember that different currencies can use the same symbol (eg $ is used by Australian and US Dollars) and that there are many currency symbols;
  3. If your site is “single” currency then just use the correct symbol for that currency. By this I mean sites like Amazon, travel sites, shopping sites and so on. These sites are single currency in the sense they are one currency at a time. They won’t be displaying Malaysian Ringits and Singapore Dollars at the same time, for example; and
  4. If your site is multi-currency then don’t use the symbol at all: use the international standard three letter currency code as defined by ISO 4217 currency names and code elements. Sites like xe.com fit into the category.

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