Oil Lamp with Sheep and Staurogram
Archeological Museum, Split, Croatia
The staurogram represents the crucified Christ, as explained on this page. The approach of sheep representing the faithful to a symbol of Christ is common in paleo-Christian art.
The label in the museum speaks of two sheep in the image, but I can see only one.
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Read more about images of the sheep/lamb symbol.
Read more about images of the staurogram symbol.
Source: Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.