This column identifies each optimized portfolio in the results. The value reports where the portfolio lies along the "Efficient Frontier" and is named with the convention Reward # / Risk #. This nomenclature quickly shows where each portfolio ranks in terms of reward and risk among the other, e.g., Optimal_Portfolio = Reward 1/Risk 20 is the first of 20 portfolios and will have the lowest risk, whereas Reward 20/Risk 1 will have the highest risk.