list box, you can select a Unicode subset in which to place your new or edited symbol. When a subset has been selected, all symbols belonging to this subset of the current symbol set are displayed in the symbols list above.
列表框中选择了非符号字体，则可以选择 Unicode 子集，以放置新的或已编辑的符号。选择了某个子集后，当前符号集的该子集含有的所有符号都将显示在上面的符号列表中。