a characteristic sound

a toroidal shape

a rigid circular band of metal or wood or other material used for holding or fastening or hanging or pulling

(chemistry) a chain of atoms in a molecule that forms a closed loop

an association of criminals

the sound of a bell ringing

a platform usually marked off by ropes in which contestants box or wrestle

jewelry consisting of a circlet of precious metal (often set with jewels) worn on the finger

a strip of material attached to the leg of a bird to identify it (as in studies of bird migration)