Have you ever seen a hat before? A Chinese hat knob is a little round button like a small knob that you can find on some Chinese-style hats. It's like a small decoration that's placed on top of the hat to make it look nicer. The knob is usually made out of materials like metal or plastic and can be different colors like gold or silver.
It's like putting a little sticker or pin on your shirt to make it look cooler or fancier. The Chinese hat knob is just like that but for a hat instead of your shirt. People like to add decorations to things they wear to make them look good or express their personalities, and the Chinese hat knob is just one of those little decorations that can make a big difference in how a hat looks.