It symbolizes absolute enlightenment, strength, elegance, the universe, and the void; it can also symbolize the Japanese aesthetic itself. As an "expression of the moment" In Zen Buddhist painting, ensō symbolizes a moment when the mind is free to simply let the body/spirit create. i like it for this one.
Enso & tree of life Tattoo Zen Buddhism, an ensō is a circle that is hand-drawn in one or two uninhibited brushstrokes to express a moment when the mind is free to let the body create. The ensō symbolizes absolute enlightenment, strength, elegance, the universe, and mu (the void). It is characterized by a minimalism born of Japanese aesthetics.