Twelve-color system analogous colors

Quick answer：

In color theory, the 'twelve-color system' refers to a color wheel arrangement that groups colors into analogous pairs, where each pair consists of two colors that are adjacent to each other on the color wheel. This system is designed to help designers and artists create harmonious color schemes by pairing colors that are closely related in hue. Each of the twelve colors is paired with another color that is one step away on the color wheel, forming a complete color circle.