What term describes balanced proportions in an object or design?

The term that describes balanced proportions in an object or design is symmetry. Symmetry refers to a property where one half of a design, shape, or object mirrors the other half, creating a sense of uniformity and proportionality. This concept is widely used in various fields such as art, architecture, and nature, where the arrangement of elements reflects balance and stability.

While balance itself relates to the distribution of visual weight in a design, symmetry is a specific type of balance that focuses on equal proportions on either side of a central axis. Asymmetry, on the other hand, denotes a lack of balance, where the elements are unequal but may still create visual interest. Harmony refers to the pleasing arrangement of parts, which can be achieved through various means, including symmetry or color, but does not specifically define the concept of equal proportions. Therefore, symmetry is the most accurate term for describing balanced proportions in objects or designs.