\psset{CodeFig=true}
\pstGeonode[PosAngle={20,90,0}]{O}(-.6,1.5){A}(1.6,-.5){B}
\pstSymO[CodeFigColor=blue,PosAngle={-90,180}]{O}{A,B}[C,D]
%\pstSymO[SegmentSymbol=pstslash, PosAngle=180]
%  {O}{B}{D}
\pstLineAB{A}{B}\pstLineAB{C}{D}
\pstLineAB{A}{D}\pstLineAB{C}{B}