The term 'ring-shaped objects' can be summarized by the word annuli, which is a six-letter word. Annuli are circular or ring-shaped objects that can be found in nature, such as the rings of Saturn, or created by humans, such as wedding rings. Annuli can also refer to mathematical concepts, such as the annulus theorem, which states that the area of a circle is equal to the area of a triangle with the same base and height.