Coffin or ballerina-shaped nails have a squared-off tip and tapered sides, resembling the shape of a coffin or a ballerina’s pointe shoe. This shape offers a trendy and edgy look, especially when paired with longer lengths.
Coffin nails is the description of a nail shape. Some describe it as a long nail like a stiletto but with a blunt end and angles at the sides in the shape of a coffin. Some also call it a "ballerina". However, ballerina-shaped nails have a little more rounded sidewalls, as opposed to the very straight sidewalls of the coffin shape.