I have a set of them
It’s to set a knife holder.
A knife rest is a small, often decorative, object used to keep the blade of a knife from touching the surface of a table or countertop when it’s not in use. They come in various shapes and materials, ranging from simple metal designs to more ornate versions made of silver, porcelain, or other materials. They can add a touch of elegance to a dining table while also serving a practical purpose.