LegendBorder is an option for Legend, which specifies the style of the line surrounding key boxes and text in a legend.
LegendBorderSpace is an option for Legend which sets the space around the entire set of key boxes and text in the legend.
LegendLabel is an option for Legend, which specifies the text to be used as the label for the legend box.
LegendPosition is an option for Legend, which specifies the location of the lower-left corner of a legend box.
LegendSize is an option for Legend which specifies the size of a legend box.
PlotLegend is an option for Plot, ListPlot, and related functions that assigns text to lines in a 2D plot to create a legend for that plot.
ShadowBackground is an option for ShadowBox or Legend, which specifies the style for a drop shadow.
ShadowForeground is an option for ShadowBox, which specifies a style for the foreground of a shadow box.
LegendLabelSpace is an option for Legend, which specifies the space for LegendLabel.
LegendSpacing is an option for Legend which specifies the amount of space around each key box on a scale where the box is 1.