What the buck ?!

Μετά από μεγάλο κάψιμο με το how I met your mother εγώ και μια φίλη είχαμε μια απορία .. Γιατί οι αμερικάνοι λένε τα δολάρια bucks. To google-άραμε and here it is:

The name "buck" came from a time (circa 1890-1920) where people would trade deer skins as a type of money in America. Male deer are called bucks and so the term "buck" became synomous with money. Through the years, dollars and bucks or buck skins were used interchangeably.