Version of the "Endless knot" symbol one degree more complex than that seen in image File:Endless_knot Red_lacquerware_dish Ming_Dynasty.jpg .

This knot has 81 crossings (79 of which are structurally significant).
Self-made image, converted from the following vector PostScript source code:

%!
.5 dup scale 1 setgray 18 setlinewidth/X{.5 add 72 mul exch .5
add 72 mul exch}def/l{X lineto}def 1 setlinejoin
0 9 X moveto 10 9 l 10 10 l 9 10 l 9 0 l 8 0 l 8 10 l 7 10 l
7 0 l 6 0 l 6 10 l 5 10 l 5 0 l 4 0 l 4 10 l 3 10 l 3 0 l 2 0
l 2 10 l 1 10 l 1 0 l 0 0 l 0 1 l 10 1 l 10 2 l 0 2 l 0 3 l
10 3 l 10 4 l 0 4 l 0 5 l 10 5 l 10 6 l 0 6 l 0 7 l 10 7 l 10
8 l 0 8 l 0 9 l closepath gsave 0 setgray 36 setlinewidth stroke
grestore stroke/r{72 mul exch 72 mul exch rlineto}def
36 setlinewidth 0 setgray
1 2 9{/z exch def 0.5 2 9.5{z X moveto 1 0 r stroke}for}for
2 2 8{/z exch def 1.5 2 7.5{z X moveto 1 0 r stroke}for}for
1.5 2 8.5{/z exch def 1 2 9{z X moveto 0 1 r stroke}for}for
0.5 2 9.5{/z exch def 2 2 8{z X moveto 0 1 r stroke}for}for
1 setgray 18 setlinewidth
1 2 9{/z exch def 0.48 2 9.48{z X moveto 1.04 0 r stroke}for}for
2 2 8{/z exch def 1.48 2 7.48{z X moveto 1.04 0 r stroke}for}for
1.48 2 8.48{/z exch def 1 2 9{z X moveto 0 1.04 r stroke}for}for
0.48 2 9.48{/z exch def 2 2 8{z X moveto 0 1.04 r stroke}for}for
showpage
%EOF
AnonMoos