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
International Committee for Information Technology Standards is to adopt as "Identical" American National Standards all ISO/IEC or ISO standards that fall within its program of work, with exceptions as outlined in our procedures. Accordingly, INCITS will adopt as "Identical" American National Standards all ISO/IEC or ISO standards that fall within its program of work. Similarly, INCITS will withdraw any such adopted American National Standard that has been withdrawn as an ISO/IEC or ISO International Standards. INCITS was established in 1961 as the Accredited Standards Committee X3, Information Technology'and is sponsored by Information Technology Industry Council (ITI), a trade association representing providers of information technology products and