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Abbreviation for the International Organization for Standardization, a developer and publisher of international standards. ISO is a network of national-standards institutes from 157 countries, with one member per country and a Central Secretariat that coordinates the system from offices in Geneva, Switzerland. (Recognizing that the acronym for International Organization for Standardization would vary widely from one member country to the next, ISO founders decided to standardize the organization acronym. ISO is derived from the Greek isos, meaning equal.) API and ISO joint committees are developing standards for worldwide use.