The term 'CENTER OF THE SYMBOL OF THE ILLUMINATI' can be solved by the 3-letter word 'EYE'. The EYE of Providence, also known as the all-seeing EYE, is a symbol that has been used for centuries and is most commonly associated with the secret society known as the Illuminati. It is believed to represent the EYE of God watching over humanity. The EYE of Providence is often depicted within a triangle, which is symbolic of the trinity.