Is there an international standard which determines the foreign exchange rate convention? For example, euro-dollar is always expressed in USD per EUR like 1.2768; dollar-yen exchange rate is expressed in JPY per USD like 111.75. However, what is the convention for Sweden Kronor and Norway Kroner would it be expressed as SEK/NOK or NOK/SEK? Same goes for Hungarian Forints and Polish Zlotych would the exchange rate be expressed as HUF/PLN or PLN/HUF?