Tombstone

Took a few moments out from Christmas shopping in Dunfermline today to pay homage to the mossy tombstones shimmering in the low winter sun at the Abbey. Bumped into my mate Alan from work at the Abbey and we discussed this one - we thought the symbols might be stonemasons tools or some 18th century freemason symbol - but after looking at the photo, I think it's a skull on it's side.