The Yellow Sign is a strange symbol, that looks somewhat like an eye, with three lines snaking out from the centre. Sometimes it looks as if the symbol moves! The horror writer Robert W. Chambers associated the Yellow Sign with Hastur, and then it became part of the Cthulhu Mythos once H.P. Lovecraft referenced Hastur in his "The Whisperer in Darkness." Most people believe the Yellow Sign to be completely fictional, but there have been a few
hallucinations sightings of it throughout history. If you see it, the sign can control you.