During a marriage ceremony, the swastika is painted on the wall or entrance of the house to wish for the well-being and happiness of the newly weds. The word swastika means auspicious in the Sanskrit language. It is regarded as a divine sign by Hindus and is usually found in temples, symbolizing the four directions, thus making it a universal symbol. It sends out pure vibrations for universal peace and prosperity.
The lines turning inwards tell us that each individual being a part of the Universe has to turn inwards in order to attain salvation. Each person has to strive for his or her self-realization by turning inwards.