A foot is a unit of measurement used for length, particularly in the imperial system. It is defined as one third of a yard or three inches. The term can also refer to a human limb used for walking and standing, consisting of two bones (the tibia and fibula) and connected by various muscles and tendons. In addition, "foot" can be used in reference to the bottom part of something, such as a table or ladder, that rests on the ground.