International Standard for currency, fund and precious metal codes.


"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."

https://www.iso.org/iso-4217-currency-codes.html