The lotus flower, the wheel of Dharma, the dorje (lighting bolt) and the mandala are a few symbols used in Buddhism to help people remember the underlying principles they represent.
The swastika is a symbol used in Buddhism, Hinduism and Bon, the animistic belief system that predated Buddhism in Tibet. "Swastik" in Sanskrit means "health", and the swastika - either right-turning or left-turning - is often used as a symbol of luck, merit or good health.