A sigil is a type of symbol used in magic. The term usually refers to a pictorial signature of a deity or spirit. In modern usage, especially in the context of chaos magic, a sigil refers to a symbolic representation of the practitioner's desired outcome.

During the Middle Ages, magic took on many forms. Instead of being able to identify one type of magic user, there were many who practiced several types of magic in these times, including monks, priests, physicians, surgeons, midwives, folk healers, and diviners. The practice of magic often consisted of using medicinal herbs for healing purposes. Classical medicine entailed magical elements. They would use charms or potions in hopes of driving out a sickness. People had strongly differing opinions as to what magic was, and because of this, it is important to understand all aspects of magic at this time.