Any valid character string, with a maximum of 10 bytes (not including null)
NLS_CURRENCY specifies the string to use as the local currency symbol for the L number format element. The default value of this parameter is determined by NLS_TERRITORY.
The value of this initialization parameter NLS_CURRENCY is used to initialize the session value of this parameter, which is the actual value referenced by the SQL query processing. This initial value is overridden by a client-side value if the client uses the Oracle JDBC driver or if the client is OCI-based and the NLS_LANG client setting (environment variable) is defined. The initialization parameter value is, therefore, usually ignored.