How do you define .shp files with solid infil?

Either with a series of smaller elements (e.g. concentric circles) or using a symbol text font (e.g. Windings).

I have a line and a diamond and i can't find a way to have the diamond solid infil.  Can you help me/

Using WINGDINGS font, the letters "t" and "u" are diamond shapes (narrow and wide).

When I utilize "Wingdings" in lieu of "Standard"  I get a definition error in line 2.  Do I have to have a path to 'Wingding' font?  Thanks for yoyr answer.

In the line definition (in acad,lin) you provide the text STYLE name, can be anything you want. In the drawing you'll need a text style defined, that is assigned the WINGDINGS font.