ISO 4217 "ruble". In addition to codes for most active national currencies ISO 4217 provides codes for "supranational" currencies, procedural purposes, and several things which are "similar to" currencies: The use of an initial letter "X" for these purposes is facilitated by the ISO 3166 rule that no official country code beginning with X will ever be assigned. Because of this rule ISO 4217 can use X codes without risk of clashing with a future country code. ISO 3166 country codes beginning with "X" are used for private custom use (reserved), never for official codes. For instance, the ISO 3166-based NATO country
ISO 22715 The International Organization for Standardization (ISO) was formed in 1947. It is a non-governmental organization (NGO) that is based in Geneva, Switzerland. The ISO has 162 members and the organization represents the interest of international standards of 196 countries. This represents almost 97 percent of the world’s population. The ISO’s purpose is to create standards that are used to help form public policies and business objectives that benefit people throughout the world. Since May 2016, there has been over 21,500 ISO standards published. The ISO develops new standards when industry sectors and their stakeholders determine that a need exists. The