Yantras are geometrical figures intended to represent the basic energies. Just as every elementary geometrical figure, a straight line, a square, a cross or a triangle etc., has a symbolic value corresponding to the basic notions, similarly, the Yantras symbolise one or the other power or energy. In other words Vedic Yantras are the graphic representations of Mantras. According to our shastras Yantra is a science which can be used through the five elements earth, water, fire, sky and air and by recitation of mantras to control nature in one's own interest. some of the very useful yantra’s are - Shri Yantra, Bagala Mukti Yantra, Kali Yantra, Shri Bhairon Yantra, Saraswati Yantra, Shri Ganesh Yantra, Nava Graha Yantra.
