In eastern thinking, three secrets are: mantra, mudra, and mandala.
Mantra is the energy, vibration and the power. Mudra is body position, which also includes breathing, how you sit, and how you hold your hands. Mandala means visualization. These visualizations are often of geometrical patterns, which have meaning to the deeper mind.
Three secrets is the foundation of both spiritual and magical work.
Also called three jewels.
These have a correspondence to head, heart and stomach, which are the three areas of our body and the psychic centers. Head is mental, heart is emotional, and stomach is physical.