Someone was recently inquiring about the display of the degree symbol. Most people are aware that entering %%d will display it within text fonts that support it. In this particular case, because the user was attempting to show a degree symbol within "Curve Text" %%d would not do.
Here is another way to show the degree symbol. This is from the Autodesk knowledge base.
1. With Numeric Lock enabled on the numeric keypad, press and hold the ALT key and then press 0,1,7, and 6 on the numeric keypad.
2. Release the ALT key.
Note: The numeric keypad is necessary.