LineLegend

LineLegend[{col1,…},{lbl1,…}] generates a legend that associates color coli with label lbli.

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

LineLegend[{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.