The term "hue cycle" refers to the sequence of colors in the color wheel. It is also known as the "color cycle" or "color spectrum". Some other synonyms for this term include "rainbow sequence" and "chromatic progression". The hue cycle is an important concept in color theory as it helps us understand the relationship between different colors and how they can be combined to create new shades and tones. It is also used in fields such as art, design, and fashion to create visually pleasing color schemes and palettes.