Autodesk AUTOCAD 2006, Command Reference Manual, Page: 1218 / 1490

Control Codes and Special Characters
In addition to using Unicode characters for entering special characters, you
can also overscore text, underscore text, or insert a special character by
including control information in the text string. Use a pair of percent signs
to introduce each control sequence.
You can use this control code with standard AutoCAD text fonts and Adobe
PostScript fonts:
%% nnn
Draws character number nnn.
%%%
Draws a single percent sign (%).
%%c
Draws circle diameter dimensioning symbol (ý).
%%d
Draws degrees symbol ( ).
%%o
Toggles overscoring on and off.
%%p
Draws plus/minus tolerance symbol (±).
1194 | Chapter 21