In feng shui, what does it mean to insert three needles in the door?

Hello, there is a janitor at the door. Don't insert three stitches casually. Gatekeepers are Taoist and folk gatekeepers. In the past, people put his idol on the door to ward off evil spirits, defend houses, maintain peace, help public utilities and bring good luck. It is one of the most popular folk protectors. It is unlucky to drive away the goalkeeper with a pin.