Yellow Sign

The Yellow Sign is a fictional symbol or glyph, first described in Robert W. Chambers' book of horror short stories The King in Yellow (1895).
The King in Yellow
The King in Yellow never fully describes the shape and purpose of the Yellow Sign. Nonetheless, "The Repairer of Reputations", one of the stories in the collection, suggests that anyone who possesses, even by accident, a copy of the sign is susceptible to some form of insidious mind control, or possession, by the King in Yellow or one of his heirs. The stories also suggest that the original creator of the sign was not human and possibly came from a strange alternate dimension that contains an ominous and ancient city known as Carcosa.
The Cthulhu Mythos
H. P. Lovecraft and many of his imitators were great admirers of Chambers' book and incorporated many of his characters and symbols into their own works. In the latter-day Cthulhu Mythos, developed by August...