Stone with the Lamb of God in a Cross
Baptistery, Aquileia Basilica
This marble slab is a "liturgical furnishing" according to the label in the baptistery. In the center of the Greek cross a lamb representing Christ carries the cross on its "shoulders." The window-shaped openings in three of the quadrants each feature a set of three circles, probably representing the Trinity.
The English on the label reads, "Open-work slab and fragment, liturgical furnishing showing cross, the 'agnus Dei' [lamb of God] and radial apertures."
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Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.