The term 'Organ of Hearing' is a reference to the EAR, which is a three-letter word: EAR. The EAR is an organ that is responsible for hearing and balance in humans and other animals. It is composed of three parts: the outer EAR, the middle EAR, and the inner EAR. The outer EAR collects sound waves and directs them into the EAR canal, where they vibrate the eardrum. The vibrations are then transmitted to the middle EAR, where they are amplified and sent to the inner EAR. The inner EAR contains the cochlea, which converts the vibrations into electrical signals that are sent to the brain, allowing us to interpret sound.