What is a "tetragrammatron"?
I ordered a shirt from ebay that had a drawing of Mary and Jesus on it. It arrived today and I love that image, but on the back is a red circle with labelled parts in some other language. The invoice that came with it says "MJ Tetragrammatron tee". Is that image a "tetragrammatron"? If so, what does it mean? I've attended church most of my life and never seen that symbol anyplace else.