16 colors

Quick answer：

In color theory, the term '16 colors' could refer to various color models or palettes. For example, it might refer to a color wheel with 16 primary, secondary, and tertiary colors. Alternatively, it could be a specific palette used in design or art. In digital color representation, '16 colors' might refer to an 8-bit color depth, which allows for 16 different colors. The exact meaning would depend on the context in which the term is used.