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Industry name for the Worldwide Tanker Nominal Freight Scale published annually by the Worldscale Association as a rate reference for shipping companies, brokers, and their customers engaged in the bulk shipping of oil in the international markets. Worldscale is a list of calculated rates for specific voyage itineraries for a standard vessel, as defined, using defined voyage cost assumptions such as vessel speed, fuel consumption, and port costs. Actual market rates for voyage charters are usually quoted in terms of a percentage of Worldscale.