 Today, there are two distinct products which have adopted the name "world currency unit".The WOCU (contraction of "world currency unit") is a standardized basket of currencies — the national currencies of the 20 largest national economies measured by GDP, established in 2008.The basket is reweighed semi-annually according to the relative growth of the economies, whereby constituent currencies are replaced by other currencies should the size of the GDP be overtaken by that of another national economy.