Currency codes or country currency codes are three-letter sequence codes representing the world’s currencies. The International Organization for Standardization issues currency codes in a list called ISO 4217.
The vast majority of these codes contain two characters relating to the country and a third character relating to the monetary unit. For example, the ISO 4217 for the USA is “USD” – US for United States and D for Dollar. e.g. EUR (euro), CAD (Canadian Dollar), GBP (Great Britain Pound).
In the foreign exchange market, these allow traders to avoid the potential confusion caused by names designating more than one currency, such as the dollar, the peso, the pound or the crown.