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The International Standardisation Organisation
(www.iso.ch) has introduced a
coding system which assigns each currency a three-character
currency code and a three-digit currency code. As some countries
have experienced currency reforms, a country's currency code may
change over time. For example, Mexico's currency code was changed
from MXP to MXN when this country introduced the nuevo peso
in January 1993. The three-character codes are constructed
by taking the two-character ISO-3166 country code
(known as ISO-3166-Alpha-2) and appending a single letter symbolizing the
name of the currency (e.g., Mexican peso MX+P = MXP; Mexican
nuevo peso MX+N = MXN). In most cases, the numeric currency code
is identical to the numeric ISO-3166 country code.
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