ISO 4217 or banking. At the 17th session (February 1978), the related UN/ECE Group of Experts agreed that the three-letter alphabetic codes for International Standard ISO 4217, "Codes for the representation of currencies and funds", would be suitable for use in international trade. Over time, new currencies are created and old currencies are discontinued. Frequently, these changes are due to the formation of new governments, treaties between countries standardizing on a shared currency, or revaluation of an existing currency due to excessive inflation. As a result, the list of codes must be updated from time to time. The ISO 4217 maintenance agency
International Organization for Standardization was created in 2009 for the purpose of "[s]tandardization in the field of energy efficiency and renewable energy sources". ISO has 162 national members. ISO has three membership categories: Participating members are called "P" members, as opposed to observing members, who are called "O" members. ISO is funded by a combination of: ISO's main products are international standards. ISO also publishes technical reports, technical specifications, publicly available specifications, technical corrigenda, and guides. International standards Technical reports Technical and publicly available specifications Technical corrigenda ISO guides These are meta-standards covering "matters related to international standardization". They are named using the format