The word squoval is a hybrid of two words: oval and square, and it's designed to define the nail shape that has rounded edges on a squarish nail. It is a very popular shape. To flie a squoval, start with the square, and when the sidewalls are straight, tilt the file underneath the corners and file back and forth from the underneath up. This will gradually take the corners off. Keep in mind that you only want to round hte part of the tip that is past the free edge so you don't remove anything from the sidewalls at the stress area and the nail remains strong.