A Witch's Knot represents the 'knot magic' that was practiced by witches in the Middle Ages. For example, a protective witch's knot like this was often scratched over doorways to keep away negative energy.
It is made of two interwoven potent symbols: The circle, which is universal, and the four-cornered knot, which is Gaelic and can be drawn in one continuous motion without lifting pen from paper. The circle is an ancient symbol used to represent an almost endless number of concepts: the sun, earth, moon, planets, God, eternity, perfection, totality, the continuity of life, heaven, protection, and the universe.
Likewise, the four-cornered Celtic knot is just as rich, representing among other things the four main Gaelic seasonal festivals; Four Druidic gods who each rule a quadrant of the earth; Good luck, as in a four-leaf clover; The four elements: earth, wind, fire and water; The four seasons; North, south, east and west.