1. The problem is to understand what CML stands for. 2. CML commonly stands for "Capital Market Line" in finance, which represents the risk-return trade-off of efficient portfolios. 3. In other contexts, CML can mean "Chronic Myeloid Leukemia" in medicine, a type of cancer. 4. Without additional context, the most common meaning is Capital Market Line in finance. 5. The Capital Market Line is a graphical representation of portfolios that optimally combine risk and return, defined by the equation: $$ CML: E(R_p) = R_f + \frac{E(R_m) - R_f}{\sigma_m} \sigma_p $$ where $E(R_p)$ is the expected return of the portfolio, $R_f$ is the risk-free rate, $E(R_m)$ is the expected return of the market portfolio, $\sigma_m$ is the standard deviation of the market portfolio, and $\sigma_p$ is the standard deviation of the portfolio. 6. This line helps investors understand the best possible expected return for a given level of risk.