What shape describes a nail that is straight across without any rounding at the edges?

The shape that describes a nail that is straight across without any rounding at the edges is referred to as a square nail. This nail shape is characterized by its flat edge, which forms a straight line across the tip, creating a sharp corner at both sides. The square shape is popular for its clean and modern appearance and is often favored for its suitability in both natural nail care and nail enhancements.

The square nail shape differs from options like a flat nail, which might indicate a more basic or unshaped nail edge and lacks the definition found in square nails. Additionally, diamond nails feature pointed tips that create a diamond-like appearance, while squoval nails combine the characteristics of both square and oval shapes, exhibiting slightly rounded edges. The distinctiveness of the square nail makes it the correct description for a nail that has a straight, unrounded edge.