The Illuminati uses it to say Satan or Lucifer is aware about everything you do i.e big brother is watching you always. This is the mostly used symbol to show their presence.
It also symbolises the eye of the Anti Messiah (or Dajjal, who is said to be blind in one eye) and the eye of Horus (an Egyptian god worshipped by the Illuminati).
It also symbolises the eye of the Anti Messiah (or Dajjal, who is said to be blind in one eye) and the eye of Horus (an Egyptian god worshipped by the Illuminati).