Analogous colours

Analogous colours are groups of colours that are adjacent to each other on a colour wheel, with one being the dominant colour.

• The dominant colour amongst a group of analogous colours is usually a primary or secondary colour.
• The immediately adjacent colours to secondary colours are tertiary colours.
• An analogous colour scheme creates a rich, monochromatic look but is less vibrant than complementary schemes.
• Red, reddish-orange, orange, yellow-orange is one example of a set of analogous colours.

https://en.wikipedia.org/wiki/Color_scheme