A napkin holder is a device used to hold napkins. A napkin holder can be made from virtually any solid material and is built so that the napkins do not slip from its hold, either by way of sandwiching them between two surfaces, or simply enclosing them on their sides in a horizontal design. Napkin holders range in price and styles from wooden designs to wrought iron or ceramic styles and many others. One iteration of the napkin holder, better known as a napkin dispenser, offers additional functionality with its design: folded napkins are enclosed in a snug metal casing, allowing users to retrieve a single napkin each time they reach into the container; this particular device is usually found in restaurants, diners, and other public eateries, while its simpler—often more aesthetically pleasing—counterpart, the holder, is common to households and classrooms. There is also an item which holds a napkin or serviette in a button hole or the top of a conventional necktie knot. It is conjectured as a clamp for the corner of a napkin and an hook which hooks into the top of the tie knot. They are most usually in sterling silver and date back to at least Edwardian times. Hence often to be found in antique outlets as functional collectors items. Certain "gentleman's clubs" include a button hole in a corner of their napkins for direct coupling to an upper shirt button.