The sternal angle, also called the angle of Louis, is an important anatomical landmark located at the junction of the manubrium and body of the sternum. This area is a valuable diagnostic tool as it coincides with the level of the second rib and marks the boundary between the superior and inferior mediastinum. Some alternative terms for the sternal angle include the jugular notch, the sternal notch, and the interclavicular notch. Additionally, it may be referred to as the sternomanubrial joint or the manubriosternal joint, reflecting its role as the site of articulation between the sternum, clavicles, and first two ribs. Accurate identification of the sternal angle is crucial in a variety of medical procedures, including pulmonary auscultation and cardiac examination.