The sternal angle, also known as the angle of Louis, is a prominent anatomical landmark located at the junction of the manubrium and body of the sternum. It is formed by the articulation of the manubrium with the body of the sternum and serves as an important reference point for various anatomical measurements and clinical procedures. The sternal angle is easily palpable and can be used to identify the second rib and the level of the second intercostal space, making it a useful landmark for locating other anatomical structures in the chest.