A bar of bullion is a precious metal in its purest and most refinest form. The term bullion refers to gold, silver, platinum, or other precious metals that have been cast into bars. Some commonly used synonyms for the term bar of bullion are bullion bar, precious metal bar, gold bar, silver bar, platinum bar, and investment bar. These bars are often used as a store of wealth or an investment vehicle due to their intrinsic value. The weight and purity of a bullion bar are often pre-determined and standardized to ensure its value and integrity in the market.