[sceptically]

I don't get it. Please explain. Is it the weird dollar sign on the stone?

[Tao3300]

That's an IHS with the letters imposed on one another. It's short for 'ihsous', Greek for Jesus.

[wheels]

Fun fact: the actual "dollar" sign is actually a P and an S superimposed, as it's actually a symbol for "peso".

[ahazred8ta]

The superimposed IHS: https://www.istockphoto.com/vector/ihs-ancient-medieval-chri...

And actually the dollar sign started out as two pillars with ribbon banners wrapped around them in an S shape, not as a P-S.

[mywittyname]

Given the context, I think that says "IHS". There are a variety of IHS symbols, some can be confused as a dollar sign.

https://cemeteries.wordpress.com/2006/08/23/ihs/