What would be a 'nice' symbol to use? If you
find one you like, enter it into UR's rich text editor by typing its hex value and pressing Alt+X (or you could use Word's Insert | Symbol feature). To use in a UR item title, select and copy it to the clipboard, then edit the title and paste.
Another way, while editing the title, is to hold down Alt, type the character code on the numeric keypad, then release Alt.