1. The twenty-two trump cards of the Tarot; those cards not included in any of the four suits. The cards numbered 0 (the Fool) through 21 (the World).
SOURCE: Designing Your Own Tarot Spreads, Teresa Michelsen
2. The 22 picture cards of the Tarot that are considered to be of vital importance by occultists. They relate to the Paths on the Tree of Life and are used in Kabalistic Pathworking.