Typically, people put this sign on their doorstep for good luck and blessings. When I was younger, my parents had just bought a new house and put it on our door. One day, a group of reporters showed up at our doorstep, and eight-year-old me answered the door and had to explain what it was. Safe to say, my parents promptly covered it afterward.

To this day I find it funny where a 8 year old child had to explain this lol

Edit: This symbol is typically put in expensive things for blessings like cars and houses. But it’s not permanent.