https://www.givemehistory.com/buddhist-symbols
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One of the oldest and most important spiritual symbols in India, the Swastika symbolizes the process of rebirth. Whereas in the western world it is used to represent Nazi ideology it has a completely different connotation in Buddhism.
It has four branches, each which symbolizes the four possible places of rebirth, namely the animal realm, the hell realm, the spirit realm, and the physical realm.
Not only is it popular in Buddhism, but it is also used in Hinduism and Jainism. You must have seen it many times imprinted on the bodies of Buddha statues or images. Today, it is also a popular symbol on many clothing items in modern Tibetan Buddhism.
Variations on the swastika have also been used by Native American tribes, and by ancient Slavic tribes.
I've also heard it referred to as Thor's Hammer in the runic alphabet. The swastika represents the hammer, twirling toward its destination after being flung by Thor.