CL stands for centiliter, which is a unit of measurement in the metric system. One centiliter is equal to one hundredth of a liter, or 10 milliliters. This unit is commonly used in countries that follow the metric system to measure small volumes of liquids, such as in cooking recipes or for beverages. For example, a standard shot of liquor is often measured as 4 centiliters. Understanding this unit can be helpful when following recipes or converting measurements in different systems.