The modern use of the word "swastika" is notoriously associated with the Nazis, and the symbol which they adopted had also been used since ancient times as a symbol of good fortune in Hinduism as well as in Buddhism and Jainism. You can read about the history of the swastika at Wikipedia.
The image below is by Hans Kundnani at Flickr, showing swastikas being used as a sign of good luck in modern-day India: