The Ensō Circle is a sacred symbol in Zen Buddhism. The ensō symbolizes absolute enlightenment, strength, elegance, the universe, and mu (the void). It is characterised by a minimalism born of Japanese aesthetics.

The open or incomplete circle represents the beauty of imperfection, while when the circle is whole, it represents the idea of perfection. The symbol in Buddhism can also be interpreted as the desire for perfection, but the recognition that the universe is the way that it is.