A form of the Triquetra symbol or trefoil knot with three 240° circular arcs grouped around an equilateral triangle (ribbons version).
Self-made graphic converted from the following vector PostScript source code:

%!
240 518 translate/z{20000 sqrt}def
27 setlinewidth .92 .96 1 setrgbcolor
0 0 100 330 90 arcn 
z 0 100 90 210 arcn
z 2 div 15000 sqrt 100 210 330 arcn closepath
gsave 45 setlinewidth 0 setgray stroke grestore stroke
45 setlinewidth 0 setgray
0 0 100 329 271 arcn stroke
z 0 100 89 31 arcn stroke
z 2 div 15000 sqrt 100 209 181 arcn stroke
27 setlinewidth .92 .96 1 setrgbcolor
0 0 100 330 270 arcn stroke
z 0 100 90 30 arcn stroke
z 2 div 15000 sqrt 100 210 180 arcn stroke
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AnonMoos