Final answer:
A chemical symbol is a one- or two-letter designation of an element, used to represent elements in chemical equations, formulas, and other scientific notations.
Step-by-step explanation:
A chemical symbol is a one- or two-letter designation of an element. For example, the chemical symbol for oxygen is O, and the chemical symbol for iron is Fe. The first letter of a symbol is always capitalized. If the symbol contains two letters, the second letter is lower case. Chemical symbols are used to represent elements in chemical equations, formulas, and other scientific notations.