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A chemical symbol is a code for a chemical element or chemical group. The term element symbol is sometimes used for the elements.
Chemical symbols for elements consist of one or two letters from the Latin alphabet, with the first letter capitalized, but can contain three when the element has a systematic temporary name. The letters are selected from the Latin name of the chemical element.
Chemical symbols have been officially chosen by the International Union of Pure and Applied Chemistry (IUPAC).
Chemical symbols for chemical groups are similar noted.