Sri Yantra
The Sri Yantra, Shri Yantra, or Shri Chakra (Sanskrit: श्री यन्त्र, IAST: śrī yantra) is a form of mystical diagram (yantra) used in the Shri Vidya school of Hinduism. Traditions associate the first known drawings of the complex yantra with the figure of Adiśaṃkarācārya mention that the earliest examples of yantras date back to 11,000–10,000 BCE. Comprising nine interlocking triangles, it embodies complex symbolism.