Blair Witch Symbol

The Legend of the Blair Witch began in 1785 with Elly Kedward who immigrated over to the town known as Blair (United States) from Ireland. 

The Blair citizens found out that she was luring the children into her house and drawing blood from them, so she was conviced of performing witchcraft. After she was conviced she was banished to the woods. By the end of that winter most of the children of Blair suddenly disappeared. The townspeople blamed the witch and proclaimed the township of Blair and the Black Woods as cursed.

The Blair Witch symbol is a five-pointed compound symbol. Its center trianglre is pointing down. The five lines resemble the microcosmic man with arms and legs outstretched inside a circle (with a pentagram in the background)-- a magic symbol or charm among medieval alchemists and wizards. Also, it might have been a a magic symbol among medieval alchemists and wizards.

Hermetic Seal Of Light

This symbol consists of geometric shapes, elemental symbols and astrological signs. Each part representing the various elements and forces needed for magical work in the quest for physical transformation and spiritual illumination and immortality.This symbol originates from the ancient Pythagorean philosophy, wherein the square, circle, the and the triangle are the emblems of the material body, the soul, and the spirit, the three elements believed to be necessary for alchemical transformation.In Alchemie these are Mercury, Salt, and Sulfur.

Crucified Serpent (Alchemical Cross)

The symbol of a crucified serpent is an old alchemical drawing representing the “fixing of the volatile,” or, making the elixir of mercury, a legendary curative, by removing the ‘volatile’ or poisonous element. The picture is derived from the biblical story of Moses, who erected a brazen snake as a charm against plague.
The crucified snake, also known as the Flamel, or the staff of Flamel in alchemical circles follows this meaning, but in mystical terms. The snake in alchemy represents poison, so the crucified snake represents removing the volatile aspects of the potion the alchemist was working with in order to create the fabled "elixir of mercury" also known as the elixir of long life, or immortality. In alchemy, though, all the material tools are symbolic of oneself, so the poison is actually the base and animalistic instincts of oneself that as an alchemist one must remove, or "crucify", in order to accomplish The Great Work.
Another interpretation of the crucified serpent comes from the Gnostic sect of Christianity. The ancient Gnostics believed that the old testament god, who they called the demiurge, was actually evil, and was trying to keep mankind from reaching salvation.