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/TC 68 Where appropriate, national standards setting bodies can propose existing national standards to ISO/TC 68 to become adopted as international standards with the approval of ISO/TC 68 and ISO. These standards must be submitted as New Work Items by three or more member countries of ISO/TC 68. In the late 1940s, members of the financial industry came together under the International Organization for Standardization (ISO) to begin developing technical standards for the banking industry to use on a world-wide basis. The original name of the organization working on banking standards was Technical Committee 68, or TC 68-Banking. Over time the scope