The Elder Sign is a symbol that supposedly protects one of the Great Old Ones/Outer Gods, who seem to fear it. It is engraved on most of the sealed doors in R'lyeh. It appears in the Dream-Quest of Unknown Kadath, where a farmer and his wife, upon being questioned about the Great Ones, rather than giving any information, "make the Elder Sign" and briefly indicate the way to the town of Ulthar to Randolph Carter.
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