The term 'listening organ' is referring to the EAR, which is a three letter word. The EAR is an organ of the body that is responsible for hearing and balance. It is made up 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. The middle EAR amplifies the sound and transmits it to the inner EAR. The inner EAR contains tiny hairs that convert the sound waves into electrical signals that are sent to the brain.