Anyone know their Milagros?

I have some sand cast tin Mexican Milagros charms but I can't figure out what the rectangle with five raised dots it supposed to be. It's not very detailed due to the casting process. Anyone have any ideas?
Where no dollieh is left behind.
https://w.dolliehsanctuary.com/sanctuary/
https://w.dolliehsanctuary.com/sanctuary/viewtopic.php?f=2&t=10113