Symbols can have one letter or character centered on the symbol.
Add a Letter Marking to a Symbol:
Double-click on the symbol in the toolbox that will include a mark.
Select the Symbol Shape tab.
In the Letter Marking box, type in the letter or character to use.
To adjust the relative vertical placement of the marking letter, select the Date and Text Properties tab.
Under Marking Letter, choose Upper, Middle, or Lower placement.
Change the Font formatting for the Symbol Mark:
Choose Format | Default Text | Symbol Mark.
Select from the Font format options.
