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A currency symbol or currency sign is a graphic symbol used to denote a currency unit. Usually it is defined by a monetary authority, such as the national central bank for the currency concerned.
A symbol may be positioned in various ways, according to national convention: before, between or after the numeric amounts: €2.50, 2,50€ and 250.
Symbols are neither defined nor listed by international standard ISO 4217, which only assigns three-letter codes.