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

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

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

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.

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