ISO 4217 is the International Standard for currency codes. The most recent edition is ISO 4217:2015.
The purpose of ISO 4217:2015 is to establish internationally recognised codes for the representation of currencies. Currencies can be represented in the code in two ways: a three-letter alphabetic code and a three-digit numeric code.
The alphabetic code is based on another ISO standard, ISO 3166, which lists the codes for country names. The first two letters of the ISO 4217 three-letter code are the same as the code for the country name, and where possible the third letter corresponds to the first letter of the currency name.
Periodically, amendments must be made to ISO 4217:2015 and these are managed by the Secretariat of the Maintenance Agency, in this case the SIX Interbank Clearing Ltd on behalf of the Swiss Association for Standardization, SNV.
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