Currency rates are equal to ratios of currency units of different countries relative
to each other. The rates are represented by 6-letter words composed of two three-letter
currency codes. The first position is occupied, as a rule, by the code of a more expensive
currency. The rates are expressed in units of the second currency per unit of the first one.
For example, rates USDCHF (USD-CHF) show the number of Swiss franks in one US dollar,
but rates GBPUSD (GBP-USD) show the number of US dollars having to be paid for one
British pound. More detailed information on the codes of financial instruments may be
found in this table.
