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Chemical Symbol Definition: A chemical symbol is a notation of one or two letters representing a chemical element.hemical Symbol Definition: A chemical symbol is a notation of one or two letters representing a chemical element.
List of chemical symbols. Most chemical elements are represented symbolically by two letters, generally the first two in their name. In some cases, the first letter together with some other letter from their name was used, particularly when their first two letters had already been allocated to another element. A very few elements have symbols which appear to have no relationship with their names. In those cases, the origin of the symbol used is given. Chemical symbol.