The term 'shape of a plane's wing' can be summarized as an AIRFOIL. An AIRFOIL is a curved surface that is designed to generate lift when air passes over it. It is commonly used in the design of aircraft wings, as well as other objects such as sails and propellers. The shape of an AIRFOIL is important for its aerodynamic performance, as it affects the amount of lift generated and the drag experienced by the object.