void d3symbol (x, y, z, sym, connect) D3AUX.C Level 2
float x, y, z Location of the symbol in user units.
int sym The symbol number.
int connect = 0 = Only the symbol is drawn
= The symbol is connected to the x-y plane by a projected  line.
= The symbol is connected to all three axis planes by projected straight lines.
d3symbol() allows you to draw a symbol in three-dimensional plots. The symbol is always drawn in the plane of the screen or paper (i.e., it is not projected). This routine replaces sym3d() which existed but was undocumented in earlier versions of GraphiC, and should be replaced by this routine.