LegendBackground is an option for Legend, which specifies the style of background to use with a legend.
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.
LegendLabelSpace is an option for Legend, which specifies the space for LegendLabel.
Legend
(Plot Legends Package Symbol) Legend[{{box_1, text_1}, ...}, options] generates a legend with the specified boxes and text.Legend[func, num, options] generates a legend by applying func to numbers between ...
LegendOrientation is an option for Legend, which specifies the direction in which key boxes are laid out.
LegendPosition is an option for Legend, which specifies the location of the lower-left corner of a legend box.
LegendShadow is an option for Legend which specifies the shadowing drawn around the legend.
LegendSize is an option for Legend which specifies the size of a legend box.