Is the Unalome a Buddhist symbol?

Last year I was walking in the "Camino de Santiago", in Spain, where I met a guy who showed me a symbol engraved in the stone of a bridge. It was a Sun that reflected its rays on the sea. He told me that it was related to Nirvana and the path one has to follow. When I came back from the journey, I tried looking for this symbol on the internet, but didn't find anything about it. The most similar one I found it has been the Unalome symbol. But it seems that all its references are linked to the tatoos, and I didn't find any wikipedia page or Buddhist website talking about it. Back to my question, is the Unalome a Buddhist symbol? Is there a Buddhist symbol similar to the one I have described? I've found the real image, can be find here in google maps photo: https://maps.app.goo.gl/moymLNdJ3LjtrZBt6