"Ancient Chinese people used to display pious and religious symbols out side their houses to word of evil spirits and attract good luck and fortune to them. In India the three most auspicious signs are those of "" SWASTIK - OM and TRISHUL "" . Hence if all these three signs are displayed together on the out side 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. This sign known as ""TRISHAKTI"" can also be used in the office or it can be kept in the purse, briefcase etc. with very good result"