Witches and wiccans use the pentagram as a symbol of faith, similar to the Christian cross. As a representation of the elements, the pentagram is involved in the wiccan practice of summoning the elemental spirits of the four directions at the beginning of a ritual. The outer circle of the circumscribed pentagram is sometimes interpreted as binding the elements together or bringing them into harmony with each other. The circle around a pentagram (transforming it in to a pentacle) is a symbol of unity, wholeness, infinity, the goddess, and protection. The five-pointed star is representative of the four primal elements (earth, air, fire and water) and traditionally a fifth, called spirit. The circle binds them together to create life.
The first crescent represents the waxing phase of the moon — new beginnings, new life, and rejuvenation. The center circle is symbolic of the full moon, the time when magic is at its most potent and powerful. Finally, the last crescent represents the waning moon — a time to do banishing magic, and to send things away.
The triple spiral or triskele is an old Celtic symbol. Its meaning is unknown. In more recent history, Celtic Christians have sometimes used it to represent the Christian Trinity. Witchcraft and wicca use the symbol to represent a variety of triplicities from their beliefs.
The triquetra is an old Celtic symbol representing trinity. A very common representation of the symbol is with a circle that goes through the three interconnected loops of the triquetra. The circle emphasizes the unity of the whole combination of the three elements. The symbol is also used by witches and wiccans, to symbolize either the wiccan triple goddess or the interconnected parts of our existence (mind, body and soul).