color sample; color chart
Refers to a physical swatch or a digital palette used for selecting colors, such as for paint, design, or web development.
I ordered color samples to decide on the wall color.
I chose the color scheme by referring to a web design color chart.
Compound of 色 (iro, 'color') and 見本 (mihon, 'sample'). The exact historical derivation is uncertain, but the word is transparently formed from these two common elements.