It symbolizes lower back portion of body. Weak Saturn in Birth chart leads to problems related to weakness, stomachache, and fits and weak bones. The Saturn Yantra help in eliminating the problems raised by weak Saturn in Birth charts.
Mantra: Om Khram Khrim Khraum Saha; Om Shaneshcharaya Namah
Saturn is the son of Sun god and Chaya (Sanvarna). He is considered as a cruel planet. The cruelty, which he possesses in his sight, is due to the curse he received from his wife. According to the astrology if the Saturn pierces and passes through the constellation of Rohini then it is considered to be very inauspicious and causes draughts for twelve years making even the survival of the living beings impossible.
Shani Yantra/ Saturn Yantra is used to propitiate an afflicted Shani/Saturn and achieve Rajayoga through complete blessings of Shani. When Saturn is malefic in a horoscope, in transit or causes Sadesati, use of Shani yantra is very beneficial. Shani yantra is useful, when one feels depressed. It indicates success in worldly affairs, success in business and the man touches the dizzy heights. Shani yantra is kept on rising moon Saturday during Venus or Saturn Hora.