Vedic 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 symbolize one or the other power or energy. In other words, Vedic Yantras are the graphic representations of Mantras. Yantras can be drawn, engraved or painted on a variety of substances.
The classical eight-tantrik surfaces are gold, silver, copper, crystal, birch, bone, hide (which can include any type of paper), and Vishnu stone (shaligram).
Yantras should always be used on the level. If drawn on paper; the colors preferable are red, orange, yellow or a combination of these. They can be drawn to whatever size is required. The two main types of yantras are Bhu and Meru. The former is flat, two dimensional, the later is of pyramidal form. In worship, they should be placed at a level on a pedestal or pitha. Before any yantra is made, a suitable object for puja, it must be given life (pran pratishtha).
The Vedic Yantras are designed to remove the afflictions to obtain a particular result e.g. to have a child, to have a positive balance in the work, or to have the awareness to control one's temper in order to enhance one's performance at work etc. The Yantras are inscribed with the mystical inscriptions of the afflicted beneficial planets at a particularly auspicious time to suit the individual wearer. The diagrams such as circles, triangles, squares and even a 'dot' are used as Yantras. All these represents cosmic energies. A dot known as bindu in Sanskrit symbolizes all pervading space-the origin of all that exists.
The yantras shall be seen daily in the morning and one shall lit incense or lamp before the yantra every morning. It is auspicious and blesses the native with success and wealth.