A coil, often referred to as a spiral, is a shape that winds around a central point, creating a continuous curve. This geometric form can be found in various natural and man-made objects, such as seashells, springs, and galaxies. Coils can be two-dimensional, like a spiral drawn on paper, or three-dimensional, like a coiled wire. In mathematics, a coil can be described using equations that define its curvature and dimensions. Coils are significant in physics and engineering, where they are used in devices like inductors and transformers to store energy and create magnetic fields.