<p>This is one of the best examples of the Egyptian origin of the cross as a symbol. It is both Ankh and Christian cross. 
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Anachrome "compatible" 3D image. (if you have red-cyan glasses, use them to see this in 3D stereo detail.)
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Quote from <a href="https://en.wikipedia.org/wiki/User:Nativeborncal" class="extiw" title="en:User:Nativeborncal">Nativeborncal</a> in <a href="https://en.wikipedia.org/wiki/Talk:Early_Christian_art_and_architecture" class="extiw" title="en:Talk:Early Christian art and architecture">en:Talk:Early Christian art and architecture</a> (Not sure about its accuracy):
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<blockquote class="templatequote language"><p>The ancient anhk symbol evolved into the key symbol of Christianity, because in Egypt it had a 2500 year pagan significance.<br>All over the rest of the Roman world, a cross was a simple tool of execution. Non-Egyptian Christians chose the fish symbol, or used an image of a youth Christ as a shepard, carrying a lamb over his shoulders. The Egyptian Christians smoothed the way to a general acceptance of the cross for Chistianity. I have posted a good example of that on the page with the bust image.
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Photographed in 3D 2005 by Allan Silliphant from a private collection in Caifornia.
8 January 2006 (according to log)
This image was copied from the <a href="https://en.wikipedia.org/wiki/wikipedia" class="extiw" title="en:wikipedia">English Wikipedia</a>