A yantra is a mystical diagram that is the house in which a Devata (God or Goddess) dwells. Worship of planetary yantras is used to remove the ill effects of malefic planets and to increase the positive influences of favorable planets.
Mangala is the God of Mars and is one of the nine primary celestial beings in Hindu Vedic astrology who are the agents of the Law of Karma.
The yantra shows Mars' symbol, the zodiac signs that Mars rules, and mantras associated with the ruling deity, Narasimha Deva. Saturn is the planet of power, strength, courage and aggression, and measures our ability to project force in life.