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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.
1 Chemical formulas are used to describe the types of atoms and their numbers in an element or compound. 2  The atoms of each element are represented by one or two different letters. 3  When more than one atom of a specific element is found in a molecule, a subscript is used to indicate this in the chemical formula.he subscript 2 means that two atoms of the element hydrogen have joined together to form a molecule. A subscript is only used when more than one atom is being represented. The graphic below illustrates the formula for water using symbols. Some more common molecules and their chemical formula.