When I started building commissioned furniture, I knew I needed to permanently claim my work. I build tables and chairs that will survive through generations. Furniture with my name on it will outlast the folks buying it. It could be passed down to family; sold away; sold again; moved around the country. I'll be long gone, but I still want the credit for having handcrafted a quality product. Call it what you want- a hallmark, trademark, logo, emblem, brand, etc. This is an important fringe benefit of my craft. Customer's get a valuable piece of woodworking, and I get to leave my mark on the world.