The term 'Sight Organ' is referring to the EYE, which is a three letter word. The EYE is an organ that is responsible for vision and is located in the front of the head. It is made up of several parts, including the cornea, iris, pupil, lens, and retina. Light enters the EYE through the pupil and is focused by the lens onto the retina, where it is converted into electrical signals that are sent to the brain. The EYE is an incredibly complex organ that allows us to see the world around us.