What is the term used to describe a shape that curves outward?

The term used to describe a shape that curves outward is "convex." In geometry, a convex shape is one where any line drawn between two points within the shape lies entirely inside the shape. This outward curvature gives convex shapes their distinctive appearance, as they bulge away from the center. Common examples of convex shapes include the sides of a circle, the outer surface of a sphere, or any polygon where all interior angles are less than 180 degrees. This outward curvature is essential in various mathematical applications, including determining properties related to shapes, areas, and volumes, as well as in real-world contexts such as lens designs and architectural elements.