A brooch holder is a device used to store and display brooches. It is typically made of metal or plastic and has a PIN on the back, allowing it to be attached to clothing or other items. The PIN is usually three letters long and is used to secure the brooch in place. Brooch holders are often decorative and can be found in a variety of shapes and sizes. They are a great way to show off your favorite brooches and keep them safe.