2.  The Kabbalah, using the symbolic system of the Tree of Life and numerological associations provided through the Hebrew language, Astrology, and Natural Science, identifies a wide range of correspondences between subjects, planets, herbs, plants, metals, crystals, colors, animals, angels, deities, etc. that allow substitutions of one thing for another, or that augment understanding about one thing by knowledge of another of corresponding value. 

Mostly the applications of correspondences are divided into Magical, Medical, Numerical, and Tarot usages.

Suggested Reading:

• The Magician’s Companion, by Bill Whitcomb
• The Western Mysteries, by David Allan Hulse