The Witches knot is a powerful symbol in folk magic. It is a symbolic representation of the knot magic practiced by witches in the middle ages, and was used as a sympathetic charm against malevolent witchcraft, usually scratched over doorways of homes and stables. One aspect of its power as a protective charm is in the ability to draw the symbol in one continuous motion. The Witches' Knot is also known as the Magic Knot and the Witch Charm. Historical witches used knotted cords to tie up the weather, to create circles of protection, and to magically bind things. The design is made up of four interweaved vesica piscis, a worldwide symbol for the yoni: the feminine creative force that gave birth to the universe. It also represents female control of the forces of nature. The Witch Knot is a popular emblem of choice for modern witches.