A palette, in the original sense of the word, is a rigid, flat surface on which a painter arranges and mixes paints. A palette is usually made of wood, plastic, ceramic, or other hard, inert, nonporous material, and can vary greatly in size and shape. The most commonly known type of painter's palette is made of a thin wood board designed to be held in the artist's hand and rest on the artist's arm. Watercolor palettes are generally made of plastic or porcelain with rectangular or wheel format with built in wells and mixing areas for colors.

From the original, literal sense above came a figurative sense by extension, referring to a selection of colors, as used in a specific art object or in a group of works comprising a visual style. This second, figurative sense is the one extended in the digital era to the computing senses of "palette".

Source: Palette (painting) from Wikipedia

This Icon is available to order as a Decal or on a T-Shirt