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A subscript or superscript is a number, figure, symbol, or indicator that is smaller than the normal line of type and is set slightly below or above it.
Stoichiometry. Stoichiometry is the process of balancing chemical equations, and subscripts in chemical formulas play in important role. Chemistry students use subscripts to calculate the number of moles (a measurement of the amount of a substance) of each element on each side of the equation.