DIMARCSYM system variable
Function Description:
The DIMARCSYM system variable is used to control the display of arc symbol in arc length dimension.
Type : Integer 
Saved in : Drawing 
Initial value : 0 
Range : 0,1,2
System Variable Value:
0 : put the arc symbol in front of dimension text
1 : put the arc symbol above dimension text 
2 : do not display arc symbol