<p>A quasi-celtic cross made of large symmetrical knot.  The knot is made up of straight lines which are vertical, horizontal, or at 45° angles, and of circular arcs all of the same radius.
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For a slightly more elaborate version, with an additional interlaced circle, see <a href="//commons.wikimedia.org/wiki/File:Celtic-knot-cross.svg" title="File:Celtic-knot-cross.svg">Celtic-knot-cross.svg</a>
AnonMoos
Derived from the original PostScript vector source code (by AnonMoos) of <a href="//commons.wikimedia.org/wiki/File:Celtic-knot-basic-linear.svg" title="File:Celtic-knot-basic-linear.svg">Celtic-knot-basic-linear.svg</a> and <a href="//commons.wikimedia.org/wiki/File:Celtic-knot-cross.svg" title="File:Celtic-knot-cross.svg">Celtic-knot-cross.svg</a><br>