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/IEC JTC 1/SC 40 governance. These include: ISO/IEC JTC 1/SC 40 ISO/IEC JTC 1/SC 40 IT Service Management and IT Governance is a standardization subcommittee of the Joint Technical Committee ISO/IEC JTC 1 of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). ISO/IEC JTC 1/SC 40 develops and facilitates the development of international standards, technical reports, and technical specifications within the fields of IT service management and IT governance, with a focus in IT activity such as audit, digital forensics, governance, risk management, outsourcing, service operations and service maintenance. The international secretariat of ISO/IEC JTC 1/SC 40 is Standards Australia