* Iron - The symbol Fe represents iron.
* (III) - The Roman numeral III indicates the oxidation state of iron in the compound is +3. This is because sulfur has an oxidation state of -2, and to balance the charges, iron must have a +3 oxidation state (2 * +3 = 6 and 3 * -2 = -6, which add up to zero).
* Sulfide - The anion S³⁻ is called sulfide.
Therefore, the IUPAC name for Fe₂S₃ is Iron(III) sulfide.
