Beard neckline
The lower edge of a beard on the neck, where trimming stops and shaving begins.
Also: neckline
The neckline is where a beard ends under the jaw. Barbers often set it about one to two finger widths above the Adam's apple and curve it back towards the ears. Set too high, the beard can look like it sits on the jaw; left too low, it can look unkempt. A well-placed neckline defines the jaw, which is why barbers adjust it for round faces and double chins. It is trimmed every few days.