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 Socialist Organization International Socialist Organization The International Socialist Organization (ISO) is a socialist organization in the United States that identifies with Trotskyism, Leninism and the Marxist political tradition of "socialism from below". The ISO advocates replacing the capitalist system with socialism, a system in which society's collective wealth and resources would be democratically controlled to meet human need by those who produce that wealth, i.e. the working class. The organization specifically argues that this working-class majority can end capitalism by leveraging their power over production through mass strikes, and that the creation of a revolutionary workers' party is necessary in coordinating and