The bracket support that holds the wooden logs inside a fireplace is called androin or fire dog. It does allow not only better air circulation and burning but also product less smoke. This element typically consists of tall vertical elements and at least two legs in the front to hold logs and not let them roll into the room. In the past, this bracket used to be made of iron, but past that, people would choose decorative elements like bronze, brass and even silver. In modern fireplaces, you will find them in various other materials and designs also.