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The term that best describes silver that is .900 pure is "Coin silver." Coin silver typically refers to silver that contains 90% silver and has been historically used for making coins and various silver items, including utensils and jewelry. This standard became widely accepted in the United States during the 19th century, especially for silver coins.

While sterling silver is comprised of .925 purity, meaning it contains 92.5% silver and is commonly used for jewelry and high-quality items, it does not match the .900 purity specified in the question. Fine silver, on the other hand, consists of .999 purity, indicating nearly pure silver, which is also not fitting here. Mexican silver often denotes pieces made in Mexico but does not specifically refer to a purity standard like coin silver does. Therefore, "Coin silver" is the most accurate designation for silver that is .900 pure.