Final answer:
A square nail is the term for a nail that is cut straight across with no rounding at the edges, often chosen for its contemporary appearance.
Step-by-step explanation:
A nail that is completely straight across with no rounding at the outside edges is commonly referred to as a square nail. The nail plate, which is the visible part of the nail, and the free margin, that protrudes beyond the distal end of the finger or toe, are both key elements of nail anatomy and come into play when shaping the nails. Square nails are often chosen for their modern look and ease of maintenance.