Each currency has its own ISO currency code.
Currency Codes are characters used to identify the currencies. They are defined by International Standards Organization under their ISO 4217 standard. It represents the currencies in two ways: a three-letter alphabetic code or a three-digit numeric code.
Alphabetic Currency Code consists of three letters. In most cases, the first two letters of the alphabetic currency code represent the country (two-letter abbreviation for country name defined by ISO 3166) and the third letter corresponds to the first letter of the currency name.
US Dollar USD
Australian dollar AUD
Canadian dollar CAD
Swiss franc CHF
Japanese yen JPY
New Zealand dollar NZD
Euro EUR
British pound GBP
Swedish krona SEK
Danish krone DKK
Krona Norwegian NOK
Singapore dollar SGD
Czech Koruna CZK
Hong Kong Dollar HKD
Mexican Peso MXN
Polish Zloty PLN
Russian Ruble RUB
Turkish Lira TRY
South African Rand ZAR