A convex shape is a closed curve or surface that curves outward and has no inward curves. It is also known as a bulging or rounded shape. Synonyms for convex shape include positive curvature, outward curvature, spherical shape, domed shape, arched shape, and curved shape. In mathematics, a convex shape is often referred to as a convex polygon, convex curve, or convex surface. The term "convex" comes from the Latin word "convexus," which means "arched" or "curved." A convex shape is the opposite of a concave shape, which curves inward and has at least one inward curve.