Found in Hindu Tantra of Hinduism and Buddhism
In Sanskrit, the word “yantra” comes from the root word “yam,” which means “instrument” or “support,” and “tra,” derived from “trana,” meaning “release from bondage.” A yantra is an instrument, or tool, for meditation and contemplation supports spiritual liberation. For mediation practices or “vastu,” the vedic version of feng shui, a yantra is embossed on a square copper plate electroplated with gold. The plates are then ritually “charged” by priests — meaning that the physical objected is “tuned” to a specific vibration or energy. Once charged, the yantra is viewed as a sacred object.
The Shri Yantra consists of nine interlocking triangles that surround a central point known as a bindu. These triangles represent the cosmos and the human body. The triangles represent the totality of the cosmos and express Advaita or non-duality. In the middle, the power point (bindu) represents the cosmic center. The triangles are circumscribed by two concentric circles composed of eight and sixteen petals, representing the lotus of creation and reproductive vital force. The entire configuration is framed by the broken lines of an earth square, representing a temple with four doors open onto the regions of the universe. It also represents the goddess in the form of Shri Lalita or Tripura Sundari, the beauty of the three worlds: Bhu Loka (Physical Plane, Consciousness of the Physical Plane), Bhuvar Loka (Antariksha or Intermediate Space Consciousness of the Prana) and Swar Loka (Svarga or Heaven or Consciousness of the Divine Mind).