Significance of Sri Chakra

From here & there

Sri Yantra, also known as Sri Chakra, is a complex sacred geometry used for worship, devotion and meditation. Yantra means ‘instrument’ or ‘machine’ in Sanskrit. This sacred symbol is in use for thousands of years, and its origin is clouded in mystery. It is one of the most difficult geometrical figures to draw. 

There are various interpretations and many figures that represent the Chakra. The three main types of Chakra are plane, pyramidal and spherical. The worship of Sri Chakra is an ancient practice followed not only in our country, but also in a few others. It is the worship of the deity in a diagrammatic form, which is regarded as the highest form of Devi worship. The Chakra is formed by nine interlocking triangles that radiate from the centre. It represents the goddess in the form of Tripura Sundari. The yantra represents the union of masculine and feminine divine.
  The description of the yantra is age-old, dating back to the time of the Upanishads, as claimed by some scholars. The Chakra is generally regarded as auspicious, beneficent and benign and leading to prosperity. It has been installed in various temples, including the Kamakshi Temple in Kanchipuram and the Mookambika Temple in Kollur (by Sri Adi Shankaracharya). It is also found in the Pashupatinath Temple, Kathmandu, Nepal. 

Generally, the Chakra is carved on a stone and is worshipped by the priest and devotees who pay obeisance to the sign that represents the supreme power. It could also be drawn on paper, precious stone, metal plates and alloys. It has its use as an astrological device too. These yantras are made on a particular date and time, according to the procedure laid out in the vedas.