Without getting into a big essay about it, the symbols they were using were: 1) lamb, 2) anchor, 3) vase, 4) dove, 5) boat, 6) olive branch, 7) the Orante, 8) palm, 9) bread, 10) the good shepherd, 11) fish, 12) vine and grapes.
The Orante - the statue in the Gauguin? "Where do we come from? What are we? Where are we going?" I read what I could find on the Gauguin to try to figure out the symbolism of it and did a search on Goddesses to see if I could find that statue, but wasn't successful.