Yen/Dollar is one of the most used couples at forex. Actually the yen is the official currency of Japan since 1871 and it is represented by different metals according to its value. There are six kinds of currencies and four circulation bills. One yen for example is made of aluminum, five yenes of tin and ten yenes of bronze.
The yen history has different sides that makes it a very interesting currency. The evolution of this currency has taken it to positions similar to dollar.
The yen value was fixed according to the rules of the world exchange rate where every currency was quoted according to the american dollar. A dollar was equal to 362 yenes. This exchange rate yen/dollar was in force from 1949 to 1971, year in which the United States let the dollar float free. Since then, yen/dollar has reduced its difference, having actually an exchange rate of 110 yenes per dollar.