Cross Currency

What Does Cross Currency Mean?
A pair of currencies traded in forex that does not include the U.S. dollar. One foreign currency is traded for another without having to first exchange the currencies into American dollars. 

Investopedia explains Cross Currency
Historically, an individual who wished to exchange a sum of money into a different currency would be required to first convert that money into U.S dollars, and then convert it into the desired currency; cross currencies help individuals and traders bypass this step. The GBP/JPY cross, for example, was invented to help individuals in England and Japan who wanted to convert their money directly without having to first convert it into U.S dollars.