Self-made graphic based on abstract geometry (a circle with radius 150 and a pentagram with its outer vertices 250 units from the center, both stroked with an outer width of about 32, and an inner width half that). So converted from a version of the following vector PostScript source code:

%!
306 396 translate/plr{250 dup 3 2 roll 72 mul 90 add
dup 3 1 roll cos mul 3 1 roll sin mul}def/A{0 0 150
0 360 arc closepath stroke 3 plr 1 plr 4 plr 2 plr 0
plr moveto 4{lineto}repeat closepath stroke}def 32
setlinewidth A 1 setgray 16 setlinewidth A showpage
%EOF

For eight-pointed star interlaced with circle, see File:Irish_compass_rose.svg