What is the meaning of the furniture term Knuckle?

In furniture, the term knuckle typically refers to a rounded protrusion or decorative detail found at the corners or joints of a piece. It is often designed to resemble a knuckle joint or knucklebone. Knuckles can be seen in various types of furniture, such as chairs, tables, or cabinets, and are commonly used to add visual interest, enhance durability, or provide structural reinforcement to the piece. Carving on the outside end of chairs.