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There are many official currencies that are used all over the world, but there only a handful of currencies that are traded actively in the forex market.On the Forex spot market, according to Triennial Survey, the most heavily traded bilateral currency pairs were:EURUSD: 28%USDJPY: 14%GBPUSD: 9%and the US currency was involved in 84.9% of transactions, followed by the euro (39.1%), the yen (19.0%), and sterling (12.9%) (see table below). Volume percentages for all individual currencies should add up to 200%, as each transaction involves two currencies.Table: Top 10 Most common currency pairs traded in forex marketRank Currency ISO 4217 code Daily Share %(April 2010)1 United States dollar USD 84.9%2 Euro EUR 39.1%3 Japanese yen JPY 19.0%