Serpentine shapes are a type of curvilinear shape that resemble a snake or serpent. They are characterized by having a continuous, smooth, and flowing line that can be used to create a variety of shapes. These shapes are often used in art, architecture, and design, as they can create a sense of movement and energy. ESSES (5 letters) is an acronym for the term 'serpentine shapes, ' which is used to describe these types of shapes.