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[edit] Summary
One form of an architectural/symbolic "quatrefoil", made of four overlapping circles. In the version of the quatrefoil shown, the circles are pulled as far apart as they can be without creating a gap in the center (i.e. circumferences of the four innermost circular white areas intersect at a single point). For different versions, see Image:Quatrefoil-Architectural-alternate.png and Image:Quatrefoil-Architectural-Square.png.
The quatrefoil is the fourfold version of an architectural trefoil (see Image:Trefoil-Architectural.png).
Generated by means of the following PostScript code:
%!
/a{c 0 360 arc fill}def
/b{168 396 a 444 396 a
306 534 a 306 258 a}def
/c{163}def b 1 setgray
/c{157}def b 0 setgray
/c{144}def b 1 setgray
/c{138}def b showpage
%%EOF
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