Tri Shakti Yantra (Swastika Om Trishul) In Brass Big This Tri-Energy symbol purifies the whole atmosphere. It is helpful to remove all faults. In India the three most auspicious signs are those of ?SWASTIK, OM and TRISHUL ". These can be used in house, office or professional place i.e. shop factory, briefcase etc. We can place it at worship place but the best place is to place above the mail door one from inside and one from outside for protection of your house. If all these three signs are displayed together on the outside of main door, it is supposed to be very lucky and also protects the people living inside the house from all types of evil eyes.