Since people manicured their nails, there have been two basic shapes: round and square. We have different nail designs. Coffin nails sometimes referred to as bullet-shaped nails, are a stylish new look for nails. They are almost curved to the top, where they are squared to create visual interest and edges. If you’re tired of regular round nails and square nails, coffin nails are perfect in between, and a trend this year.