A cup holder is a device, such as a zarf, to hold a cup or other drinking vessel. It may be free standing to hold cups securely on a desk or other flat surface, or in a tree style to store sets of cups in kitchens. They may be built into automobiles or chairs, or fixed to the walls of airplanes, boats, buses and trains.
Before the automobile cup holders, many buses and trains were built with wall-mounted cup holders. These cup holders are usually constructed by thin stainless steel plates. Some of them are covered by rubber. There are now many cup holders available which can be screwed to the walls of boats and buses and recreational vehicles.
Another popular cup holder for boats is the “drop in” cup holder. This is a round plastic item, that has a lip at the top. It requires that a hole is drilled into the boat’s table or console and then the unit is inserted and the lip holds it in place. These do not accommodate cups with handles.