Are all world currencies traded on the Forex exchange?

Some of the Forex retailers do trade in more obscure currencies, explains Investopedia. However, the more mainstream retailers trade in the most liquid and fluid currency sets. There are seven sets most commonly traded.

Each trade by Forex entails two types of currency, as the investor trades one for the other. The most commonly traded currencies are the U.S. dollar, the euro, the Japanese yen, the British pound, the Swiss franc, the Australian dollar, the Canadian dollar and the New Zealand dollar, states Investopedia. These currencies trade in a variety of pairings, but some pairings are more common than others.