The Sri Yantra (sacred instrument) or Sri Chakra (sacred wheel) is a yantra formed by nine interlocking triangles that surround and radiate out from the central (bindu) point, the junction point between the physical universe and its unmanifest source. It represents the goddess in her form of Lalita Mahatripurasundari, an aspect of Parvati Devi, "the beauty of the three worlds (Heaven, Earth, Hell)".
The Sri Yantra is the object of devotion in Sri Vidya. The term 'Shri' is used to denote the reverence to be given to this holy Yantra. The prefix 'Shri' denotes that the Yantra is auspicious, beneficent, salutary, benign and conducive to prosperity. It is an instrument which bestows wealth. Here, wealth means both spiritual and material.
The Shri chakra is often referred as the chakra Raja which means King of all Chakra which makes it a supreme instrument in the path of spiritual advancement. Four isosceles triangles with the apices upwards, representing Shiva or the Masculine. Five isosceles triangles with the apices downward, symbolizing female embodiment Shakti. Thus the Sri Yantra also represents the union of Masculine and Feminine Divine. Because it is composed of nine triangles, it is known as the Navayoni Chakra. "These nine triangles are of various sizes and intersect with one another. In the middle is the power point (bindu), visualizing the highest, the invisible, elusive centre from which the entire figure and the cosmos expand. The triangles are enclosed by two rows of (8 and 16) petals, representing the lotus of creation and reproductive vital force. The broken lines of the outer frame denote the figure to be a sanctuary with four openings to the regions of the universe".
This Sri yantra is crafted from natural rock crystal which gives it a life of more than 100 years. As per Ramayana "Lord Rama and Lord Laxman sat on a crystal rock". Sphatik carries the properties of prosperity, happiness and brings harmony to the house where it is worshipped. Crystal helps in gaining a better understanding of our instinctual powers. Sphatik idols are considered highly auspicious for puja purpose. Sphatik idols remove any negative energies in the area, it is kept.