The term "Whale Tail" commonly refers to the distinctive shape of a whale's fluke when it is raised above the water's surface. This behavior often occurs when a whale dives deep into the ocean, signaling its departure from the surface. The tail can vary in size and shape depending on the species of whale, such as the humpback whale or killer whale. In a different context, "Whale Tail" can also describe a popular design in fashion, particularly in swimwear. This style features a high-cut back that resembles the shape of a whale's tail, often seen in bikinis and one-piece swimsuits. The design is favored for its aesthetic appeal and can enhance the wearer's silhouette.