Sri Yantra

Sri Yantra A.I. Render.

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.[1] 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 addition to Mount Meru, all other yantras derive the Sri Yantra.

Reference: https://en.wikipedia.org/wiki/Sri_Yantra