USD - U.S. Dollar, the financial slang used by the name of greenback ( "green back"), buck (Baks), dolly.

EUR - Euro, the single European currency (valid throughout the European space).

GBP - British Pound Sterling, the financial slang used the name Pound (Great Britain Pounds), Sterling (sterling), cable (cable).

CHF - Swiss Franc, the financial slang used by the name of Swiss (swissy).

JPY - Japanese Yen.

Before the advent of Euro currency, a large share of the market accounted for the deutsche mark (DEM).

Other currencies
SAD - Canadian Dollar.

AUD - Australian dollar, the financial slang used the name ossi (aussie).

NZD - New Zealand Dollar, the financial slang used by the name kiwi (kiwi).