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 37 ISO/IEC JTC 1/SC 37 ISO/IEC JTC 1/SC 37 Biometrics is a standardization subcommittee in the Joint Technical Committee ISO/IEC JTC 1 of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), which develops and facilitates standards within the field of biometrics. The international secretariat of ISO/IEC JTC 1/SC 37 is the American National Standards Institute (ANSI), located in the United States. ISO/IEC JTC 1/SC 37 was established in August 2002, after the approval of a proposal submitted by ANSI to ISO/IEC JTC 1 for the establishment of a new JTC 1 subcommittee on biometrics. The main purpose