Mercury symbolizes Vocal Cords or sound. Mercury (Budh) Yantra on Bhoj patra is an auspicious instrument use to appease the planet Mercuru (Budh). Weak Budha in Birth chart leads to problems related to skin, Gal Bladder, Education and paralysis. Other malefic effects indicated by Mercury are, mental diseases, nervous break down, hyper sensitiveness, difficulties in vocal expressions, stammering etc. The Mercury Yantra helps in eliminating the problems raised by weak Budha in Birth chart.