The intertragic notch is an anatomical feature of the ears of mammals. In humans, it is the space that separates the tragus from the antitragus in the outer ear.
It is the point specified (although not by that name) in the U.S. Army's regulation governing the length of sideburns in male soldiers.Army Regulation 670–1 (3 February 2005),”Wear and Appearance of Army Uniforms and Insignia”, 1-8, a, (2), b. “Sideburns will not extend below the lowest part of the exterior ear opening.”
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