Final answer:
The hair in a square one length above the shoulders haircut is cut at the nape of the neck.
Step-by-step explanation:
In a square one length above the shoulders haircut, the hair is cut at the nape of the neck.
Starting at the nape of the neck allows for a uniform length throughout the haircut. It also provides a strong foundation for creating shape and structure.
By beginning at the nape of the neck, the hair can be cut in horizontal sections, ensuring an even and consistent result.