The Triangular Book of St. Germain or The Triangular Manuscript is an untitled 18th-century French text written in code, and attributed to the legendary Count of St. Germain. It takes its name from its physical shape: the binding and sheets of vellum that comprise the manuscript are in the shape of an equilateral triangle. The text, once deciphered, details a magical operation through which a person can perform feats of magic, notably the discovery of treasure and extension of life.
