PointLegend

PointLegend[{col1, ...}, {lbl1, ...}] generates a legend that associates points of colors coli with labels lbli.

• PointLegend[{col1, ...}, Automatic] generates a legend with placeholder labels.
• PointLegend[{lbl1, ...}] represents a legend with inherited colors within visualization functions.

Styling options

PointLegend supports LegendFunction, LegendLayout, LegendMargins, LabelStyle, RoundingRadius, and Background.

• LegendFunction accepts the named functions "Panel", "Frame", "Framed", "DarkFrame", and "Frameless". Arbitrary functions are not currently supported.
• LegendLayout accepts "Row", "Column", "ReversedRow", and "ReversedColumn".
• LegendMargins accepts either one margin for every side or {{left, right}, {top, bottom}}.
• LabelStyle supports colors, FontFamily, and FontSize.
• RoundingRadius sets the corner radius of the legend container.
• Background sets the container background.

Examples

PointLegend[{Red, Blue, Green}, {"A", "B", "C"}]

ListPlot[{{1, 4, 2}, {2, 3, 5}},
 PlotLegends -> PointLegend[{"Series 1", "Series 2"}]]

PointLegend[{Red, Blue}, Automatic]

ListPlot[{{1, 4, 2}, {2, 3, 5}},
 PlotLegends -> PointLegend[Automatic, {"Series 1", "Series 2"},
   LegendFunction -> "Framed",
   Background -> White,
   LegendLayout -> "Row"
 ]
]

Please visit the official Wolfram Language Reference for more details.