You can use Unicode characters, control codes, and special characters in a text string to represent symbols. (All nontext characters must be entered as their ASCII equivalent.)
You can create special characters by entering the following Unicode character strings:
| 
 Unicode character descriptions  | 
|
|---|---|
| 
 Unicode character  | 
 Description  | 
| 
 \U+00B0  | 
 Degree symbol  | 
| 
 \U+00B1  | 
 Plus/minus tolerance symbol  | 
| 
 \U+2205  | 
 Diameter dimensioning symbol  | 
In addition to using Unicode characters for special characters, you can specify a special character by including control information in the text string. Use a pair of percent signs (%%) to introduce each control sequence. For example, the following control code works with standard AutoCAD text and PostScript fonts to draw character number nnn:
%%nnn
These control codes work with standard AutoCAD text fonts only:
| 
 Control code descriptions  | 
|
|---|---|
| 
 Control code  | 
 Description  | 
| 
 %%o  | 
 Toggles overscore mode on and off  | 
| 
 %%u  | 
 Toggles underscore mode on and off  | 
| 
 %%d  | 
 Draws degree symbol  | 
| 
 %%p  | 
 Draws plus and minus tolerance symbol  | 
| 
 %%c  | 
 Draws diameter dimensioning symbol  | 
| 
 %%%  | 
 Draws single percent sign  |