SwatchLegend

SwatchLegend[{col1,…},{lbl1,…}] generates a legend that associates swatches of colors coli with labels lbli.

SwatchLegend[{col1,…},Automatic] generates a legend with placeholder labels for the colors coli.

SwatchLegend[{lbl1,…}] represents a legend with inherited colors within visualization functions.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.