Yantra is a Sanskrit word meaning machine, that which sustains energy, or a geometrical design meant to represent a deity or to hold that deity’s Shakti. Yantras are used in meditation and to sharpen awareness. The Shri Yantra—nine interlocking triangles around a bindu, the diagram of Tripura Sundari—is the best-known example.
Within the International Nath Order a yantra is a working diagram, not a charm and not a scripture. It may sit on a zonule as a focus. Shri Gurudev Mahendranath wrote that yantra designs help the mind concentrate, and that work in the umbra zonule can include diagrams you are given or diagrams you draw. That is not a taviz (a charged paper) and not a rudraksha (a seed). This page names the class. It does not teach the nine circuits of the Shri Chakra.
