The Sri Yantra or Sri Chakra is a form of mystical diagram (yantra) used in the Shri Vidya school of Hindu tantra. It consists of nine interlocking triangles that surround a central point known as a bindu. Because of its nine triangles, Sri Yantra is also known as the Navayoni Chakra. When the two-dimensional Sri Yantra is represented in three dimensions, it is called a Maha Meru. Mount Meru derives its name from this shape.
In the 2009 issue of Brahmavidya (the journal of the Adyar Library), Subhash Kak argues that the description of Sri Yantra is identical to the yantra described in the Śvetāśvatara Upanisad.
The Sri Yantra's 9 constituent triangles vary in size and shape and intersect to form 43 smaller triangles, organized in 5 concentric levels. Together they 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 8 and 16 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 600 BCet open onto the regions of the universe.
The worship of the Sri Yantra is central to the Shri Vidya system of Hindu worship. It 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). The Sri Yantra is the symbol of Hindu tantra, which is based on the Hindu philosophy of Kashmir Shivaism. The Sri Yantra is the object of devotion in Sri Vidya. ← The Sri Yantra represents the union of Masculine and Feminine Divine. The four upward-pointing isosceles triangles represent the goddess's masculine embodiment Shiva, while the five downward-pointing triangles symbolize the female embodiment Shakti.