So why is EUR/USD called a "fibre"? Some say that "fibre" probably follows the trend
of other currency pair nicknames like the GBP/USD's "cable" moniker. Cable was derived from the way in which data was transferred between the two countries (i.e. a huge cable under the Atlantic Ocean that synchronized the GBP/USD quote). It is quite possible that fibre reflects the fibre optic age of communications.