Budha Kavacham - PRO

The Planet Mercury is known in Vedic Astrology as Lord Budha, the awakened discriminating intellect and the part of us that knows. Budha rules over two signs of the zodiac, Gemini and Virgo. While the Moon is the presiding deity of the human mind, Budha-Mercury is the intellect that discriminates between good and bad ideas. Budha-Mercury rules discrimination and vichara, deep enquiry. (For an idea about the depths of vichara, consider Sri Yoga Vasistha.)
Planet Budha-Mercury governs speech, communications, has a strong influence on short-distance travel, and the intellect - the faculty within which forms thought. In Sanskrit, the intellect is called buddhi.