What is the embellishment on the top of the design supposed to be?

 St Bride, Cwmdauddwr, Rhayader, Powys
(Click on an image for a larger version)
 

A large Victorian Church set in an extensive graveyard. This church in its early Celtic monastic foundation was part of a number of ‘clas’ throughout the Elan Valley. Today it serves the village of Cwmdauddwr and the Elan valley beyond.


 
What is the embellishment on the top of the design supposed to be?
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Where is the best place to see pictures of other unusual graves?

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